Happy Memorial Day! Please note that AoPS Online is closed May 24-26th.

Contests & Programs AMC and other contests, summer programs, etc.
AMC and other contests, summer programs, etc.
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Contests & Programs AMC and other contests, summer programs, etc.
AMC and other contests, summer programs, etc.
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k a May Highlights and 2025 AoPS Online Class Information
jlacosta   0
May 1, 2025
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]
Our full course list for upcoming classes is below:
All classes run 7:30pm-8:45pm ET/4:30pm - 5:45pm PT unless otherwise noted.

Introductory: Grades 5-10

Prealgebra 1 Self-Paced

Prealgebra 1
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Prealgebra 2 Self-Paced

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Introduction to Counting & Probability Self-Paced

Introduction to Counting & Probability
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Introduction to Number Theory
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Introduction to Algebra B Self-Paced

Introduction to Algebra B
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Introduction to Geometry
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Paradoxes and Infinity
Mon, Tue, Wed, & Thurs, Jul 14 - Jul 16 (meets every day of the week!)

Intermediate: Grades 8-12

Intermediate Algebra
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Intermediate Counting & Probability
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Precalculus
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Advanced: Grades 9-12

Olympiad Geometry
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Calculus
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Group Theory
Thursday, Jun 12 - Sep 11

Contest Preparation: Grades 6-12

MATHCOUNTS/AMC 8 Basics
Friday, May 23 - Aug 15
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Tues & Thurs, Jul 8 - Aug 14 (meets twice a week!)

MATHCOUNTS/AMC 8 Advanced
Sunday, May 11 - Aug 10
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AMC 10 Problem Series
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Thursday, May 22 - Jul 31

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F=ma Problem Series
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Visit the pages linked for full schedule details for each of these programs!


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Programming

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Physics

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Physics 1: Mechanics
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Relativity
Mon, Tue, Wed & Thurs, Jun 23 - Jun 26 (meets every day of the week!)
0 replies
jlacosta
May 1, 2025
0 replies
[TEST RELEASED] OMMC Year 5
DottedCaculator   129
N 19 minutes ago by fuzimiao2013
Test portal: https://ommc-test-portal-2025.vercel.app/

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/

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 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?

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?

Solo teams?

Test Policy

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:

Prizes:

I have more questions. Whom do I ask?

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]
129 replies
DottedCaculator
Apr 26, 2025
fuzimiao2013
19 minutes ago
Inequalities
sqing   21
N 2 hours ago by sqing
Let $ a,b,c>0 , a+b+c +abc=4$. Prove that
$$ \frac {a}{a^2+2}+\frac {b}{b^2+2}+\frac {c}{c^2+2} \leq 1$$Let $ a,b,c>0 , ab+bc+ca+abc=4$. Prove that
$$ \frac {a}{a^2+2}+\frac {b}{b^2+2}+\frac {c}{c^2+2} \leq 1$$
21 replies
sqing
May 15, 2025
sqing
2 hours ago
Inequalities
sqing   22
N 2 hours ago by sqing
Let $ a,b>0   $ . Prove that
$$ \frac{a}{a^2+a +2b+1}+ \frac{b}{b^2+2a +b+1}  \leq  \frac{2}{5} $$$$ \frac{a}{a^2+2a +b+1}+ \frac{b}{b^2+a +2b+1}  \leq  \frac{2}{5} $$
22 replies
sqing
May 13, 2025
sqing
2 hours ago
Minimize
lgx57   3
N 2 hours ago by MathRook7817
Minimize $\sqrt{\cos^2 x+(2-\sin x)^2}+\dfrac{1}{2}\sqrt{(\sqrt 3-\cos x)^2+(\sin x+1)^2}$
3 replies
lgx57
Friday at 1:29 PM
MathRook7817
2 hours ago
Base 2n of n^k
KevinYang2.71   50
N 2 hours ago by ray66
Source: USAMO 2025/1, USAJMO 2025/2
Let $k$ and $d$ be positive integers. Prove that there exists a positive integer $N$ such that for every odd integer $n>N$, the digits in the base-$2n$ representation of $n^k$ are all greater than $d$.
50 replies
KevinYang2.71
Mar 20, 2025
ray66
2 hours ago
[CASH PRIZES] IndyINTEGIRLS Spring Math Competition
Indy_Integirls   55
N 3 hours ago by GallopingUnicorn45
[center]IMAGE

Greetings, AoPS! IndyINTEGIRLS will be hosting a virtual math competition on May 25,
2024 from 12 PM to 3 PM EST.
Join other woman-identifying and/or non-binary "STEMinists" in solving problems, socializing, playing games, winning prizes, and more! If you are interested in competing, please register here![/center]

----------

[center]Important Information[/center]

Eligibility: This competition is open to all woman-identifying and non-binary students in middle and high school. Non-Indiana residents and international students are welcome as well!

Format: There will be a middle school and high school division. In each separate division, there will be an individual round and a team round, where students are grouped into teams of 3-4 and collaboratively solve a set of difficult problems. There will also be a buzzer/countdown/Kahoot-style round, where students from both divisions are grouped together to compete in a MATHCOUNTS-style countdown round! There will be prizes for the top competitors in each division.

Problem Difficulty: Our amazing team of problem writers is working hard to ensure that there will be problems for problem-solvers of all levels! The middle school problems will range from MATHCOUNTS school round to AMC 10 level, while the high school problems will be for more advanced problem-solvers. The team round problems will cover various difficulty levels and are meant to be more difficult, while the countdown/buzzer/Kahoot round questions will be similar to MATHCOUNTS state to MATHCOUNTS Nationals countdown round in difficulty.

Platform: This contest will be held virtually through Zoom. All competitors are required to have their cameras turned on at all times unless they have a reason for otherwise. Proctors and volunteers will be monitoring students at all times to prevent cheating and to create a fair environment for all students.

Prizes: At this moment, prizes are TBD, and more information will be provided and attached to this post as the competition date approaches. Rest assured, IndyINTEGIRLS has historically given out very generous cash prizes, and we intend on maintaining this generosity into our Spring Competition.

Contact & Connect With Us: Email us at indy@integirls.org.

---------
[center]Help Us Out

Please help us in sharing the news of this competition! Our amazing team of officers has worked very hard to provide this educational opportunity to as many students as possible, and we would appreciate it if you could help us spread the word!
55 replies
Indy_Integirls
May 11, 2025
GallopingUnicorn45
3 hours ago
2019 PMO Qualifying Stage III.3
wonderboy807   2
N 3 hours ago by aops-g5-gethsemanea2
A sequence \{a_n\}_{n \geq 1} of positive integers is defined by a_1 = 2 and for integers n > 1,

\frac{1}{a_1} + \frac{1}{a_2} + \cdots + \frac{1}{a_{n-1}} + \frac{n}{a_n} = 1.

Determine the value of \sum_{k=1}^{\infty} \frac{3^k(k+3)}{4^k a_k}.
2 replies
wonderboy807
4 hours ago
aops-g5-gethsemanea2
3 hours ago
a tst 2013 test
Math2030   6
N 3 hours ago by Math2030
Given the sequence $(a_n):   a_1=1, a_2=11$ and $a_{n+2}=a_{n+1}+5a_{n}, n \geq 1$
. Prove that $a_n $not is a perfect square for all $n > 3$.
6 replies
Math2030
Yesterday at 5:26 AM
Math2030
3 hours ago
MTG MOSTP 2025 Handout Problem.
wonderboy807   2
N 3 hours ago by LilKirb
Let S_n = \sqrt{1 + \frac{1}{1^2} + \frac{1}{2^2}} + \sqrt{1 + \frac{1}{2^2} + \frac{1}{3^2}} + ... + \sqrt{1 + \frac{1}{n^2} + \frac{1}{(n+1)^2}} What is the numerical ratio of \frac{S_{2024}}{2024}?

2 replies
wonderboy807
4 hours ago
LilKirb
3 hours ago
Original Problem: Geometry and Functions
wonderboy807   1
N 4 hours ago by wonderboy807
For any positive integer n, let F(n) be the number of interior diagonals in a convex polygon with n+3 sides. Find 1/(F(1)) + 1/(F(2)) + ... + 1/F(10))

Answer: Click to reveal hidden text
1 reply
wonderboy807
4 hours ago
wonderboy807
4 hours ago
How Math WOOT Level 2 prepare you for olympiad contest
AMC10JA   0
5 hours ago
I know how you do on Olympiad is based on your effort and your thinking skill, but I am just curious is WOOT level 2 is generally for practicing the beginner olympiad contest (like USAJMO or lower), or also good to learn for hard olympiad contest (like USAMO and IMO).
Please share your thought and experience. Thank you!
0 replies
AMC10JA
5 hours ago
0 replies
[Sipnayan SHS] Written Round, Average, #4.6
LilKirb   4
N Yesterday at 8:13 PM by Shan3t
Define the function
\[f(n) = \sum_{k=0}^{n} \binom{n}{k} a_k, \quad n = 1, 2, 3, \ldots\]where
\[a_k = 
    \begin{cases}
        3^k, & \text{if } k \text{ is even}, \\
        0, & \text{if } k \text{ is odd}.
        \end{cases}
\]Find the remainder when \( f(10^9 + 2) \) is divided by \( 2^{20} + 1 \)
4 replies
LilKirb
Yesterday at 2:25 PM
Shan3t
Yesterday at 8:13 PM
Remaining balls
pacoga   4
N Yesterday at 8:12 PM by mafj
A bag contains $20$ white balls, $30$ red balls and $40$ black balls. We extract balls at random without replacement until the bag becomes empty. What is the probability that there are still black and red balls in the bag when the last white ball is drawn?

4 replies
pacoga
Feb 3, 2021
mafj
Yesterday at 8:12 PM
Linear algebra
Feynmann123   4
N Yesterday at 7:54 PM by OGMATH
Hi everyone,

I was wondering whether when I tried to compute e^(2x2 matrix) and got the expansions of sinx and cosx with the method of discounting the constant junk whether it plays any significance. I am a UK student and none of this is in my School syllabus so I was just wondering…


4 replies
Feynmann123
Yesterday at 6:44 PM
OGMATH
Yesterday at 7:54 PM
Mathcounts state
happymoose666   40
N May 8, 2025 by ZMB038
Hi everyone,
I just have a question. I live in PA and I sadly didn't make it to nationals this year. Is PA a competitive state? I'm new into mathcounts and not sure
40 replies
happymoose666
Mar 24, 2025
ZMB038
May 8, 2025
Mathcounts state
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happymoose666
339 posts
#1 • 2 Y
Y by PikaPika999, nmlikesmath
Hi everyone,
I just have a question. I live in PA and I sadly didn't make it to nationals this year. Is PA a competitive state? I'm new into mathcounts and not sure
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programjames1
3046 posts
#2 • 2 Y
Y by PikaPika999, nmlikesmath
Pennsylvania is about median in difficulty. See the cutoff map from last year.
This post has been edited 1 time. Last edited by programjames1, Mar 24, 2025, 10:38 PM
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Andyluo
997 posts
#3 • 3 Y
Y by programjames1, PikaPika999, nmlikesmath
programjames1 wrote:
Pennsylvania is about median in difficulty. See the cutoff map from last year.

this data is skewed because generally bad states wouldn't post their scores.

Here, Ohio and PA are both shown to be slightly below average, but they both placed 14th and 18th out of 50 states and 6 territories.
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BossLu99
1394 posts
#4 • 1 Y
Y by nmlikesmath
happymoose666 wrote:
Hi everyone,
I just have a question. I live in PA and I sadly didn't make it to nationals this year. Is PA a competitive state? I'm new into mathcounts and not sure

hey yo whats ur name im in PA too
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programjames1
3046 posts
#5 • 1 Y
Y by nmlikesmath
Andyluo wrote:
this data is skewed because generally bad states wouldn't post their scores.

Here, Ohio and PA are both shown to be slightly below average, but they both placed 14th and 18th out of 50 states and 6 territories.

Cutoffs are different from top scorers though. I did MATHCOUNTS in two states, each of which typically ranked between 20th and 30th, and had cutoffs one or two points lower than Pennsylvanias. The difference between those states and Pennsylvania is the scores were much closer together.
This post has been edited 2 times. Last edited by programjames1, Mar 24, 2025, 11:06 PM
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happymoose666
339 posts
#7 • 1 Y
Y by nmlikesmath
BossLu99 wrote:
happymoose666 wrote:
Hi everyone,
I just have a question. I live in PA and I sadly didn't make it to nationals this year. Is PA a competitive state? I'm new into mathcounts and not sure

hey yo whats ur name im in PA too

Is your name benjamin Lu
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Math-lover1
332 posts
#8 • 1 Y
Y by nmlikesmath
happymoose666 wrote:
BossLu99 wrote:
happymoose666 wrote:
Hi everyone,
I just have a question. I live in PA and I sadly didn't make it to nationals this year. Is PA a competitive state? I'm new into mathcounts and not sure

hey yo whats ur name im in PA too

Is your name benjamin Lu

yes he is
Benorz the GOAT

btw I'm the norz viktor wang
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happymoose666
339 posts
#9 • 1 Y
Y by nmlikesmath
he got second
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Pengu14
636 posts
#10 • 1 Y
Y by nmlikesmath
viktorz :omighty:
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ethan2011
346 posts
#11 • 1 Y
Y by nmlikesmath
happymoose666 wrote:
he got second

he got 1st written, 2nd cdr, so i'd say he got 1st
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nmlikesmath
523 posts
#12
Y by
the amount of orzness coming from this post is so high its dangerous
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nmlikesmath
523 posts
#13
Y by
bruh my california chapter is so hard I got 39 and was like 1 away from state qual :wallbash_red:
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fxx11
51 posts
#14 • 1 Y
Y by nmlikesmath
@happymoose666 what grade are you in
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Math-lover1
332 posts
#15 • 1 Y
Y by nmlikesmath
ethan2011 wrote:
happymoose666 wrote:
he got second

he got 1st written, 2nd cdr, so i'd say he got 1st

wait are you Ethan qi
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ethan2011
346 posts
#16 • 1 Y
Y by nmlikesmath
Math-lover1 wrote:
ethan2011 wrote:
happymoose666 wrote:
he got second

he got 1st written, 2nd cdr, so i'd say he got 1st

wait are you Ethan qi

no
I don't live in pa
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fxx11
51 posts
#17 • 1 Y
Y by nmlikesmath
happymoose666 wrote:
Hi everyone,
I just have a question. I live in PA and I sadly didn't make it to nationals this year. Is PA a competitive state? I'm new into mathcounts and not sure

r u Shawn Ruan?
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orangebear
716 posts
#18 • 1 Y
Y by nmlikesmath
Pengu14 wrote:
viktorz :omighty:

You mean you orz
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Cerberusman
317 posts
#19 • 1 Y
Y by nmlikesmath
orangebear wrote:
Pengu14 wrote:
viktorz :omighty:

You mean you orz

Off topic but I love your pfp :10:
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Math-lover1
332 posts
#20 • 1 Y
Y by nmlikesmath
fxx11 wrote:
happymoose666 wrote:
Hi everyone,
I just have a question. I live in PA and I sadly didn't make it to nationals this year. Is PA a competitive state? I'm new into mathcounts and not sure

r u Shawn Ruan?

no he isn't based off chapter score
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BossLu99
1394 posts
#22
Y by
who is happy moose bro
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ZMB038
280 posts
#23
Y by
@Bosslu99 good luck at nats, you were really good in states.
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happymoose666
339 posts
#24
Y by
ZMB038 wrote:
@Bosslu99 good luck at nats, you were really good in states.

Who are you???
I'm from springhouse
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ZMB038
280 posts
#25
Y by
I'm just a random 6th grader who went to states but did not make cdr :wallbash: .
My chapter is SUPER easy.
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ZMB038
280 posts
#26 • 1 Y
Y by Math-lover1
happy moose are you John Xie, or Robert Zhou?
This post has been edited 1 time. Last edited by ZMB038, Apr 23, 2025, 7:39 PM
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Math-lover1
332 posts
#27
Y by
ZMB038 wrote:
happy moose are you John Xie, or Robert Zhou?

Pretty sure orangebear is John Xie, I know he got CDR (9th-10th) range
This post has been edited 1 time. Last edited by Math-lover1, Apr 25, 2025, 12:29 AM
Reason: edit edit
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ZMB038
280 posts
#28
Y by
Math-lover1 wrote:
ZMB038 wrote:
happy moose are you John Xie, or Robert Zhou?

Pretty sure orangebear is John Xie, I know he got CDR (9th-10th) range

Thanks math-lover1/vicktor wamg
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BossLu99
1394 posts
#29
Y by
ZMB038 wrote:
@Bosslu99 good luck at nats, you were really good in states.

thanks bro
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ZMB038
280 posts
#30
Y by
yeah ofc
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LostRiptide
29 posts
#31
Y by
happymoose666 wrote:
Hi everyone,
I just have a question. I live in PA and I sadly didn't make it to nationals this year. Is PA a competitive state? I'm new into mathcounts and not sure

I'd say the best 2-3 people are quite competitive but the competitiveness generally falls off fast for PA.
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tikachaudhuri
83 posts
#32
Y by
Nice I’m from PA too and I also didn’t make nats :D

Afaik BossLu, orangebear, and MathLover are all cdr people
This post has been edited 1 time. Last edited by tikachaudhuri, Apr 29, 2025, 8:02 PM
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tikachaudhuri
83 posts
#33
Y by
ZMB038 wrote:
happy moose are you John Xie, or Robert Zhou?

not Robert Zhou… :skull: \jk
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orangebear
716 posts
#34
Y by
tikachaudhuri wrote:
ZMB038 wrote:
happy moose are you John Xie, or Robert Zhou?

not Robert Zhou… :skull: \jk

Oh now I know who you are.
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neeyakkid23
129 posts
#35
Y by
Math-lover1 wrote:
happymoose666 wrote:
Is your name benjamin Lu
yes he is
Benorz the GOAT
why are you glazing this ben jit so hard
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tikachaudhuri
83 posts
#36
Y by
Robert Zhou beat me in cdr chapter and then he beat me at cdr state :skull
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ZMB038
280 posts
#37
Y by
tikachaudhuri wrote:
Robert Zhou beat me in cdr chapter and then he beat me at cdr state :skull

Tika Chaudhuri, Ben Lu, and Robert Zhou are all from the same chapter. Delaware County Chapter in PA is goated.
This post has been edited 1 time. Last edited by ZMB038, May 3, 2025, 6:26 PM
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fxx11
51 posts
#38 • 1 Y
Y by happypi31415
trust in centre county chapter
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happypi31415
754 posts
#39
Y by
fxx11 wrote:
trust in centre county chapter

i can confirm that central will be pretty strong next year :maybe:
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Math-lover1
332 posts
#40
Y by
LostRiptide wrote:

I'd say the best 2-3 people are quite competitive but the competitiveness generally falls off fast for PA.

ouch that hurt
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tikachaudhuri
83 posts
#41
Y by
Math-lover1 wrote:
LostRiptide wrote:

I'd say the best 2-3 people are quite competitive but the competitiveness generally falls off fast for PA.

ouch that hurt

(Math-lover1 got 7th so that's why he's saying that)

Viktorz
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Inaaya
418 posts
#42
Y by
ZMB038 wrote:
tikachaudhuri wrote:
Robert Zhou beat me in cdr chapter and then he beat me at cdr state :skull

Tika Chaudhuri, Ben Lu, and Robert Zhou are all from the same chapter. Delaware County Chapter in PA is goated.

i can personally confirm that Tika Chaudhuri is goated
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ZMB038
280 posts
#44
Y by
Inaaya wrote:
ZMB038 wrote:
tikachaudhuri wrote:
Robert Zhou beat me in cdr chapter and then he beat me at cdr state :skull

Tika Chaudhuri, Ben Lu, and Robert Zhou are all from the same chapter. Delaware County Chapter in PA is goated.

i can personally confirm that Tika Chaudhuri is goated

YES! Like I know her, and she thinks she is a failure! If she is a failure what am I?
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