FAMC Summer Contest 2015

May is an exciting month! National MATHCOUNTS is the second week of May in Washington D.C. and our Founder, Richard Rusczyk will be presenting a seminar, Preparing Strong Math Students for College and Careers, on May 11th.

Are you interested in working towards MATHCOUNTS and don’t know where to start? We have you covered! If you have taken Prealgebra, then you are ready for MATHCOUNTS/AMC 8 Basics. Already aiming for State or National MATHCOUNTS and harder AMC 8 problems? Then our MATHCOUNTS/AMC 8 Advanced course is for you.

Summer camps are starting next month at the Virtual Campus in math and language arts that are 2 - to 4 - weeks in duration. Spaces are still available - don’t miss your chance to have an enriching summer experience. There are middle and high school competition math camps as well as Math Beasts camps that review key topics coupled with fun explorations covering areas such as graph theory (Math Beasts Camp 6), cryptography (Math Beasts Camp 7-8), and topology (Math Beasts Camp 8-9)!

Be sure to mark your calendars for the following upcoming events:
[list][*]May 9th, 4:30pm PT/7:30pm ET, Casework 2: Overwhelming Evidence — A Text Adventure, a game where participants will work together to navigate the map, solve puzzles, and win! All are welcome.
[*]May 19th, 4:30pm PT/7:30pm ET, What's Next After Beast Academy?, designed for students finishing Beast Academy and ready for Prealgebra 1.
[*]May 20th, 4:00pm PT/7:00pm ET, Mathcamp 2025 Qualifying Quiz Part 1 Math Jam, Problems 1 to 4, join the Canada/USA Mathcamp staff for this exciting Math Jam, where they discuss solutions to Problems 1 to 4 of the 2025 Mathcamp Qualifying Quiz!
[*]May 21st, 4:00pm PT/7:00pm ET, Mathcamp 2025 Qualifying Quiz Part 2 Math Jam, Problems 5 and 6, Canada/USA Mathcamp staff will discuss solutions to Problems 5 and 6 of the 2025 Mathcamp Qualifying Quiz![/list]
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All classes run 7:30pm-8:45pm ET/4:30pm - 5:45pm PT unless otherwise noted.

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0 replies

jlacosta

May 1, 2025

0 replies

k i Adding contests to the Contest Collections

dcouchman 1

N Apr 5, 2023 by v_Enhance

Want to help AoPS remain a valuable Olympiad resource? Help us add contests to AoPS's Contest Collections.

Find instructions and a list of contests to add here: https://artofproblemsolving.com/community/c40244h1064480_contests_to_add

1 reply

dcouchman

Sep 9, 2019

v_Enhance

Apr 5, 2023

k i Zero tolerance

ZetaX 49

N May 4, 2019 by NoDealsHere

Source: Use your common sense! (enough is enough)

Some users don't want to learn, some other simply ignore advises.
But please follow the following guideline:

To make it short: ALWAYS USE YOUR COMMON SENSE IF POSTING!
If you don't have common sense, don't post.

More specifically:

For new threads:

a) Good, meaningful title:
The title has to say what the problem is about in best way possible.
If that title occured already, it's definitely bad. And contest names aren't good either.
That's in fact a requirement for being able to search old problems.

Examples:
Bad titles:
- "Hard"/"Medium"/"Easy" (if you find it so cool how hard/easy it is, tell it in the post and use a title that tells us the problem)
- "Number Theory" (hey guy, guess why this forum's named that way¿ and is it the only such problem on earth¿)
- "Fibonacci" (there are millions of Fibonacci problems out there, all posted and named the same...)
- "Chinese TST 2003" (does this say anything about the problem¿)
Good titles:
- "On divisors of a³+2b³+4c³-6abc"
- "Number of solutions to x²+y²=6z²"
- "Fibonacci numbers are never squares"

b) Use search function:
Before posting a "new" problem spend at least two, better five, minutes to look if this problem was posted before. If it was, don't repost it. If you have anything important to say on topic, post it in one of the older threads.
If the thread is locked cause of this, use search function.

Update (by Amir Hossein). The best way to search for two keywords in AoPS is to input
[code]+"first keyword" +"second keyword"[/code]
so that any post containing both strings "first word" and "second form".

c) Good problem statement:
Some recent really bad post was:
[quote] $lim_{n\to 1}^{+\infty}\frac{1}{n}-lnn$ [/quote]
It contains no question and no answer.
If you do this, too, you are on the best way to get your thread deleted. Write everything clearly, define where your variables come from (and define the "natural" numbers if used). Additionally read your post at least twice before submitting. After you sent it, read it again and use the Edit-Button if necessary to correct errors.

For answers to already existing threads:

d) Of any interest and with content:
Don't post things that are more trivial than completely obvious. For example, if the question is to solve $x^{3}+y^{3}=z^{3}$ , do not answer with " $x=y=z=0$ is a solution" only. Either you post any kind of proof or at least something unexpected (like " $x=1337, y=481, z=42$ is the smallest solution). Someone that does not see that $x=y=z=0$ is a solution of the above without your post is completely wrong here, this is an IMO-level forum.
Similar, posting "I have solved this problem" but not posting anything else is not welcome; it even looks that you just want to show off what a genius you are.

e) Well written and checked answers:
Like c) for new threads, check your solutions at least twice for mistakes. And after sending, read it again and use the Edit-Button if necessary to correct errors.

To repeat it: ALWAYS USE YOUR COMMON SENSE IF POSTING!

Everything definitely out of range of common sense will be locked or deleted (exept for new users having less than about 42 posts, they are newbies and need/get some time to learn).

The above rules will be applied from next monday (5. march of 2007).
Feel free to discuss on this here.

49 replies

ZetaX

Feb 27, 2007

NoDealsHere

May 4, 2019

Interesting inequalities

sqing 1

N 2 hours ago by sqing

Source: Own

Let $a,b,c \geq 0$ and $ab+bc+ca- abc =3.$ Show that
$a+k(b+c)\geq 2\sqrt{3 k}$ Where $k\geq 1.$
Let $a,b,c \geq 0$ and $2(ab+bc+ca)- abc =31.$ Show that
$a+k(b+c)\geq \sqrt{62k}$ Where $k\geq 1.$

1 reply

sqing

2 hours ago

sqing

2 hours ago

Harmonic Mean

Happytycho 4

N 2 hours ago by elizhang101412

Source: Problem #2 2016 AMC 12B

The harmonic mean of two numbers can be calculated as twice their product divided by their sum. The harmonic mean of $1$ and $2016$ is closest to which integer?

$\textbf{(A)}\ 2 \qquad \textbf{(B)}\ 45 \qquad \textbf{(C)}\ 504 \qquad \textbf{(D)}\ 1008 \qquad \textbf{(E)}\ 2015$

4 replies

Happytycho

Feb 21, 2016

elizhang101412

2 hours ago

euler function

mathsearcher 0

2 hours ago

Prove that there exists infinitely many positive integers n such that
ϕ(n) | n+1

0 replies

mathsearcher

2 hours ago

0 replies

Simple but hard

Lukariman 1

N 3 hours ago by Giant_PT

Given triangle ABC. Outside the triangle, construct rectangles ACDE and BCFG with equal areas. Let M be the midpoint of DF. Prove that CM passes through the center of the circle circumscribing triangle ABC.

1 reply

Lukariman

4 hours ago

Giant_PT

3 hours ago

Floor function and coprime

mofumofu 13

N 3 hours ago by Thapakazi

Source: 2018 China TST 2 Day 2 Q4

Let $k, M$ be positive integers such that $k-1$ is not squarefree. Prove that there exist a positive real $\alpha$ , such that $\lfloor \alpha\cdot k^n \rfloor$ and $M$ are coprime for any positive integer $n$ .

13 replies

mofumofu

Jan 9, 2018

Thapakazi

3 hours ago

Old problem

kwin 0

3 hours ago

Let $a, b, c > 0$ . Prove that:
$(a^2+b^2)(b^2+c^2)(c^2+a^2)(ab+bc+ca)^2 \ge 8(abc)^2(a^2+b^2+c^2)^2$

0 replies

1 viewing

kwin

3 hours ago

0 replies

Interesting inequalities

sqing 2

N 3 hours ago by sqing

Source: Own

Let $a,b,c \geq 0$ and $abc+2(ab+bc+ca) =32.$ Show that
$ka+b+c\geq 8\sqrt k-2k$ Where $0<k\leq 4.$
$ka+b+c\geq 8$ Where $k\geq 4.$
$a+b+c\geq 6$ $2a+b+c\geq 8\sqrt 2-4$

2 replies

sqing

Yesterday at 2:51 PM

sqing

3 hours ago

RMM 2013 Problem 3

dr_Civot 79

N 3 hours ago by Ilikeminecraft

Let $ABCD$ be a quadrilateral inscribed in a circle $\omega$ . The lines $AB$ and $CD$ meet at $P$ , the lines $AD$ and $BC$ meet at $Q$ , and the diagonals $AC$ and $BD$ meet at $R$ . Let $M$ be the midpoint of the segment $PQ$ , and let $K$ be the common point of the segment $MR$ and the circle $\omega$ . Prove that the circumcircle of the triangle $KPQ$ and $\omega$ are tangent to one another.

79 replies

dr_Civot

Mar 2, 2013

Ilikeminecraft

3 hours ago

Inspired by KhuongTrang

sqing 7

N 4 hours ago by TNKT

Source: Own

Let $a,b,c\ge 0$ and $a+b+c=3.$ Prove that
$\frac{1}{ab+2}+\frac{1}{bc+2}+\frac{1}{ca+2}\ge \frac{6}{abc+5}$ $\frac{1}{ab+2}+\frac{1}{bc+2}+\frac{1}{ca+2}\ge \frac{7}{abc+6}$ $\frac{1}{ab+2}+\frac{1}{bc+2}+\frac{1}{ca+2}\ge \frac{21}{17(abc+1)}$ $\frac{1}{ab+2}+\frac{1}{bc+2}+\frac{1}{ca+2}\ge \frac{42}{17(abc+2)}$

7 replies

sqing

Jan 21, 2024

TNKT

4 hours ago

Cycle in a graph with a minimal number of chords

GeorgeRP 5

N 4 hours ago by Photaesthesia

Source: Bulgaria IMO TST 2025 P3

In King Arthur's court every knight is friends with at least $d>2$ other knights where friendship is mutual. Prove that King Arthur can place some of his knights around a round table in such a way that every knight is friends with the $2$ people adjacent to him and between them there are at least $\frac{d^2}{10}$ friendships of knights that are not adjacent to each other.

5 replies

GeorgeRP

Wednesday at 7:51 AM

Photaesthesia

4 hours ago

Sum of bad integers to the power of 2019

mofumofu 8

N 4 hours ago by Orthocenter.THOMAS

Source: China TST 2019 Test 2 Day 2 Q6

Given coprime positive integers $p,q>1$ , call all positive integers that cannot be written as $px+qy$ (where $x,y$ are non-negative integers) bad, and define $S(p,q)$ to be the sum of all bad numbers raised to the power of $2019$ . Prove that there exists a positive integer $n$ , such that for any $p,q$ as described, $(p-1)(q-1)$ divides $nS(p,q)$ .

8 replies

mofumofu

Mar 11, 2019

Orthocenter.THOMAS

4 hours ago

Jane street swag package? USA(J)MO

arfekete 31

N 5 hours ago by vsarg

Hey! People are starting to get their swag packages from Jane Street for qualifying for USA(J)MO, and after some initial discussion on what we got, people are getting different things. Out of curiosity, I was wondering how they decide who gets what.
Please enter the following info:

- USAMO or USAJMO
- Grade
- Score
- Award/Medal/HM
- MOP (yes or no, if yes then color)
- List of items you got in your package

I will reply with my info as an example.

31 replies

arfekete

May 7, 2025

vsarg

5 hours ago

Suggestions for preparing for AMC 12

peppermint_cat 2

N 5 hours ago by peppermint_cat

So, I have decided to attempt taking the AMC 12 this fall. I don't have any experience with math competitions, and I thought that here might be a good place to see if anyone who has taken the AMC 12 (or done any other math competitions) has any suggestions on what to expect, how to prepare, etc. Thank you!

2 replies

peppermint_cat

6 hours ago

peppermint_cat

5 hours ago

[MAIN ROUND STARTS MAY 17] OMMC Year 5

DottedCaculator 61

N Today at 12:14 AM by fuzimiao2013

Hello to all creative problem solvers,

Do you want to work on a fun, untimed team math competition with amazing questions by MOPpers and IMO & EGMO medalists? $\phantom{You lost the game.}$
Do you want to have a chance to win thousands in cash and raffle prizes (no matter your skill level)?

Check out the fifth annual iteration of the

Online Monmouth Math Competition!

Online Monmouth Math Competition, or OMMC, is a 501c3 accredited nonprofit organization managed by adults, college students, and high schoolers which aims to give talented high school and middle school students an exciting way to develop their skills in mathematics.

Our website: https://www.ommcofficial.org/
Our Discord (6000+ members): https://tinyurl.com/joinommc
Test portal: https://ommc-test-portal.vercel.app/

This is not a local competition; any student 18 or younger anywhere in the world can attend. We have changed some elements of our contest format, so read carefully and thoroughly. Join our Discord or monitor this thread for updates and test releases.

How hard is it?

We designed OMMC to be accessible to beginners but also challenging to experts. Earlier questions on the main round will be around the difficulty of easy questions from the AMC 8 and AMC 10/12, and later questions will be at the difficulty of the hardest questions from the AIME. Our most skilled teams are invited to compete in an invitational final round consisting of difficult proof questions. We hope that teams will have fun and think deeply about the problems on the test, no matter their skill level.

We plan to raffle out a TON of prizes over all competitors regardless of performance. So just submit: a few minutes of your time will give you a great chance to win amazing prizes!

How are the problems?

Only the best problems by our panel of dedicated and talented problem writers have been selected. Hundreds upon hundreds of problems have been comprehensively reviewed by our panel of equally wonderful testsolvers. Our content creation staff has achieved pretty much every mathematical achievement possible! Staff members have attended MOP, participated in MIT-PRIMES, RSI, SPARC, won medals at EGMO, IMO, RMM, etc. Our staff members have contributed to countless student-led math organizations and competitions in the past and we all have a high degree of mathematical experience under our belts. We believe OMMC Year 5 contains some of our best work thus far.

You can check out our past problems and sample problems here:
https://www.ommcofficial.org/sample
https://www.ommcofficial.org/2022-documents
https://www.ommcofficial.org/2023-documents
https://www.ommcofficial.org/ommc-amc

How will the test be held?/How do I sign up?

We highly recommend competitors join our Community Discord for the latest updates on the competition, as well as for finding team members to team up with. Each team is between 1 and 4 people, inclusive. Each competitor in a team has to be 18 or younger. You won’t have to sign up right now. Look out for a test portal link by which teams can register and access the test. Teams will put in their registration information as they submit the test.

However, we do encourage you to “sign up” on this thread, just like how you might with a mock contest. This isn’t required to take the test nor does it force you to take the test. But it’s a great way to show support and bump the thread to the top of the forums, so we appreciate it. (Also a great way to find teammates!)

Solo teams?

Solo participants are allowed and will be treated simply as one man teams. They will be eligible for the same prizes as teams with multiple people.

Test Policy

Our test will be held completely online and untimed. We do not allow the use of anything other than writing utensils, scratch paper, compass, ruler/straightedge, and a single four function calculator (addition, subtraction, multiplication, division).

Timeline:
Main Round: May 17th - May 24th
Test Portal Released. The Main Round of the contest is held. The Main Round consists of 25 questions that each have a numerical answer. Teams will have the entire time interval to work on the questions. They can submit any time during the interval. Teams are free to edit their submissions before the period ends, even after they submit.

Final Round: May 26th - May 28th
The top placing teams will qualify for this invitational round (5-10 questions). The final round consists of 5-10 proof questions. Teams again will have the entire time interval to work on these questions and can submit their proofs any time during this interval. Teams are free to edit their submissions before the period ends, even after they submit.

Conclusion of Competition: Early June
Solutions will be released, winners announced, and prizes sent out to winners.

Scoring:

For the main round, there are 25 computational (number answer questions). Each of the 25 questions will be worth 2 points, for a total of 50 points. Ties are broken by the last (highest numbered) question that one team solved and the other team didn’t, MATHCOUNTS-style. The team that solved this question would be given preference. For example, if teams A and B both have scores of 24, but Team A got question 20 wrong and Team B got question 25 wrong, then team A will be given preference over team B because team A solved question 25.

The top ~10-15 teams will move onto the final round, where there are 5-10 proof questions. Each of the questions is worth a different number of points (the specific weighting will be given to each of the finalist teams). The Olympiad round in total will be worth 50 points. A team’s total OMMC index will be the sum of the main round score and the final round score (out of 50+50=100), and teams will be ranked on their OMMC index (if there are ties, they will be broken by the aforementioned main round tie breaking system).

Prizes:

Prize List So Far:
- TBD

In past years we’ve received $5000+ in prizes. Stay tuned for more details, but we intend to give prizes to all teams on the leaderboard, as well as raffle out a TON of prizes over all competitors. So just submit: a few minutes of your time will give you a great chance to win amazing prizes!

I have more questions. Whom do I ask?

We respond most quickly on our community discord, but you can also contact us through email via the ommcofficial@gmail.com address.

We hope for your participation, and good luck!

OMMC staff

OMMC’S 2025 EVENTS ARE SPONSORED BY:

[list]
[*]Nontrivial Fellowship
[*]Citadel
[*]SPARC
[*]Jane Street
[*]And counting!
[/list]

61 replies

DottedCaculator

Apr 26, 2025

fuzimiao2013

Today at 12:14 AM

FAMC Summer Contest 2015

brianzhang 107

N Jul 8, 2015 by mathsrrocks

Welcome to the FAMC Summer Contest 2015 (Fun AoPS Math Contest)

If you want to sign up, PM Benq. We have to close the Google Signups sheet due to trolling. Questions can be asked below. Big thanks to AoPS.
Use this for submissions.

FAMC contributors

brianzhang- problem write
Benq- problem writer/ test solver
Richardq- problem writer
WhaleVomit- problem writer
dhusb45- formatting and sign ups

IMAGE

Some more information:
* The test will be released on June 20th. Participants will have until July 6th to take the test.
* You will have 38 minutes and 5 seconds to complete the test.
* The test will have 16 questions and a tiebreaker. All must be completed within the time limit.

107 replies

brianzhang

Jun 14, 2015

mathsrrocks

Jul 8, 2015

FAMC Summer Contest 2015

G H J

Reveal topic tags

FUN AOPS MATH CONTEST

G H BBookmark kLocked kLocked NReply

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brianzhang

224 posts

brianzhang

#1 h Jun 14, 2015, 4:41 PM • 15 Y

Y by DeathLlama9, WhaleVomit, nosaj, jasonhu4, Benq, dhusb45, cpma213, CaptainFlint, dantx5, C-bass, hotstuffFTW, mathguy24, srg12, solzonmars, Adventure10

brianzhang- problem write
Benq- problem writer/ test solver
Richardq- problem writer
WhaleVomit- problem writer
dhusb45- formatting and sign ups

Some more information:
* The test will be released on June 20th. Participants will have until July 6th to take the test.
* You will have 38 minutes and 5 seconds to complete the test.
* The test will have 16 questions and a tiebreaker. All must be completed within the time limit.

Attachments:

ProblemsV.1.1.2 2.pdf (397kb)

This post has been edited 18 times. Last edited by brianzhang, Jun 30, 2015, 4:37 PM

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mathguy623

1855 posts

mathguy623

#2 h Jun 14, 2015, 4:54 PM • 2 Y

Y by Adventure10, Mango247

Has the test been created yet? Also, is it going to be the same difficulty as the other FAMC?

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WhaleVomit

1452 posts

WhaleVomit

#3 h Jun 14, 2015, 5:19 PM • 1 Y

Y by Adventure10

As of now, in my opinion, it is harder, thanks to Benq (maybe there will even be a little trig involved)

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hwl0304

1840 posts

hwl0304

#4 h Jun 14, 2015, 5:21 PM • 2 Y

Y by Adventure10, Mango247

Wait where am I >_<

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jasonhu4

1556 posts

jasonhu4

#5 h Jun 14, 2015, 5:22 PM • 2 Y

Y by Adventure10, Mango247

Are the questions of like AIME difficulty?

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WhaleVomit

1452 posts

WhaleVomit

#6 h Jun 14, 2015, 5:24 PM • 2 Y

Y by Adventure10, Mango247

Probably around AMC 10 #19ish and harder

This post has been edited 1 time. Last edited by WhaleVomit, Jun 14, 2015, 5:24 PM

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Benq

3396 posts

Benq

#7 h Jun 14, 2015, 5:34 PM • 2 Y

Y by Adventure10, Mango247

Early ones are significantly easier though.

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mathguy623

1855 posts

mathguy623

#8 h Jun 14, 2015, 6:14 PM • 2 Y

Y by mathisawesome2169, Adventure10

Mm hmm, "Easy" for Benq meaning #26 on amc 13.

And darn I have only a little bit of time to take this before going to Cornell.

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AMC_Kid

1013 posts

AMC_Kid

#9 h Jun 14, 2015, 7:04 PM • 2 Y

Y by Adventure10, Mango247

But he was referring to significantly easier that number 19 on and 10 so like 15-25 on AMC 8 I guess... Lol number 26 on AMC 13

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brianzhang

224 posts

brianzhang

#10 h Jun 14, 2015, 8:11 PM • 2 Y

Y by Adventure10, Mango247

mathguy623 wrote:

Mm hmm, "Easy" for Benq meaning #26 on amc 13.

And darn I have only a little bit of time to take this before going to Cornell.

Wait, people can't to mock tests at AMSP?

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mathguy623

1855 posts

mathguy623

#11 h Jun 14, 2015, 8:15 PM • 1 Y

Y by Adventure10

Well I mean I wouldn't have much time there and I'd be preoccupied with other things.

And sadly my school ends June 25th

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AMC_Kid

1013 posts

AMC_Kid

#12 h Jun 14, 2015, 8:52 PM • 3 Y

Y by akshaygowrish, Adventure10, Mango247

Same with me..ugghh snow- days

This post has been edited 1 time. Last edited by AMC_Kid, Jun 14, 2015, 9:02 PM

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hwl0304

1840 posts

hwl0304

#13 h Jun 14, 2015, 8:58 PM • 3 Y

Y by mathguy623, rjiang16, Adventure10

brianzhang wrote:

mathguy623 wrote:

Mm hmm, "Easy" for Benq meaning #26 on amc 13.

And darn I have only a little bit of time to take this before going to Cornell.

Wait, people can't to mock tests at AMSP?

no, but there are better things to do...

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Wave-Particle

3690 posts

Wave-Particle

#14 h Jun 14, 2015, 11:19 PM • 1 Y

Y by Adventure10

Well Benq suggested I should do this, I hope the problems are good

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dhusb45

365 posts

dhusb45

#15 h Jun 15, 2015, 6:19 PM • 4 Y

Y by InCtrl, Andre1228, Adventure10, Mango247

Oops it started as FAMC not FAMO

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hwl0304

1840 posts

hwl0304

#98 h Jul 2, 2015, 4:22 AM • 1 Y

Y by Adventure10

anandiyer12 wrote:

Ok I submitted, can someone PM me my score and my current rank. Thanks.

Me too

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Benq

3396 posts

Benq

#100 h Jul 4, 2015, 1:10 AM • 2 Y

Y by Adventure10, Mango247

Still 26 submissions...

Attachments:

ProblemsV.1.1.4.2.pdf (396kb)

This post has been edited 1 time. Last edited by Benq, Jul 4, 2015, 3:18 AM

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doitsudoitsu

1415 posts

doitsudoitsu

#101 h Jul 4, 2015, 1:57 AM • 1 Y

Y by Adventure10

hwl0304 wrote:

anandiyer12 wrote:

Ok I submitted, can someone PM me my score and my current rank. Thanks.

Me too

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rafa2be

834 posts

rafa2be

#102 h Jul 4, 2015, 11:58 PM • 2 Y

Y by Adventure10, Mango247

When will the official testing be over? Also, when will the leaderboard be posted? I assume right after?

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Benq

3396 posts

Benq

#103 h Jul 5, 2015, 2:47 AM • 1 Y

Y by Adventure10

July 6, right after.

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Benq

3396 posts

Benq

#104 h Jul 6, 2015, 1:49 AM • 1 Y

Y by Adventure10

bump still 28 submissions.

Latest version of test: https://docs.google.com/document/d/1LWWoZD5SNU383L-rmJs7_7Qvszt23td6oBKJpb7b8yI/edit?usp=sharing

This post has been edited 2 times. Last edited by Benq, Jul 6, 2015, 2:07 AM

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Ancy

412 posts

Ancy

#105 h Jul 6, 2015, 4:18 AM • 2 Y

Y by Adventure10, Mango247

UGH I PRESSED SUBMIT Hold on...

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Benq

3396 posts

Benq

#106 h Jul 6, 2015, 1:50 PM • 2 Y

Y by Adventure10, Mango247

Note: Contestants have all day today to submit.

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Benq

3396 posts

Benq

#107 h Jul 7, 2015, 2:39 PM • 1 Y

Y by Adventure10

Question: What should the time limit have been?

Attachments:

ProblemsV.1.1.5.pdf (397kb)

Results.pdf (76kb)

AnswerKeyandSolutions.pdf (458kb)

This post has been edited 7 times. Last edited by Benq, Jan 18, 2016, 2:51 AM

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speck

1727 posts

speck

#108 h Jul 7, 2015, 3:17 PM • 1 Y

Y by Adventure10

So I don't know how to divide -> tiebreaker is like 13. I ended up just bashing a lot of problems, namely #16, which took like half my time. Tiebreaker was actually pretty easy to bash with calculus, and finding $117^{-1} \text{ (mod 1000)}$ takes a lot of time if you don't know lots of NT. Overall I thought that the test was very good.

EDIT: Oops reality check should have shown that 13>10 and AC<10 so 13 definitely cannot be tiebreaker.

This post has been edited 2 times. Last edited by speck, Jul 7, 2015, 3:24 PM

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InCtrl

871 posts

InCtrl

#109 h Jul 7, 2015, 6:22 PM • 1 Y

Y by Adventure10

10-15 more minutes would have lifted my score by 2 or 3, which i think pushes it into the "acceptable percentage" range.

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doitsudoitsu

1415 posts

doitsudoitsu

#110 h Jul 7, 2015, 9:51 PM • 1 Y

Y by Adventure10

I don't get the answer to #6. If he should aim at #10, then since everyone has perfect logic, everyone would aim at the highest numbered guy, so they wouldn't pair up.

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Benq

3396 posts

Benq

#111 h Jul 7, 2015, 10:03 PM • 2 Y

Y by Adventure10, Mango247

That's not true since then there would be an odd number of people left.

This post has been edited 1 time. Last edited by Benq, Jul 7, 2015, 11:01 PM

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mathsrrocks

56 posts

mathsrrocks

#112 h Jul 8, 2015, 3:50 PM • 2 Y

Y by Adventure10, Mango247

Are you still taking submissions?

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mathsrrocks

56 posts

mathsrrocks

#113 h Jul 8, 2015, 3:51 PM • 2 Y

Y by Adventure10, Mango247

Never mind
Just saw a previous post

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