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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]
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0 replies
jlacosta
May 1, 2025
0 replies
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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
J
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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
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How to get a 300+ on the NWEA MAP MATH test (URGENT)
nmlikesmath   26
N 10 minutes ago by valisaxieamc
I have 4 days till this test, I'm wondering how do I get a 300+ and what do I need to know, thank you.
26 replies
nmlikesmath
May 3, 2025
valisaxieamc
10 minutes ago
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9 Mathcounts poll
AndrewZhong2012   17
N 33 minutes ago by tikachaudhuri
Last year I got 14th at States and 3rd in Chapter
This year I got 91.5 on AMC 10A.
Do you guys think I can get to nationals this year? I am in PA. This year is also my last chance.

17 replies
AndrewZhong2012
Jan 7, 2025
tikachaudhuri
33 minutes ago
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2025 MATHCOUNTS State Hub
SirAppel   849
N 36 minutes ago by maxamc
Previous Years' "Hubs": (2022) (2023) (2024)Please Read

Now that it's April and we're allowed to discuss ...
[list=disc]
[*] CA: 43 (45 44 43 43 43 42 42 41 41 41)
[*] NJ: 43 (45 44 44 43 39 42 40 40 39 38) *
[*] NY: 42 (43 42 42 42 41 40 38 38 38 38 38 38)
[*] TX: 42 (43 43 43 42 42 40 40 38 38 38)
[*] MA: 41 (45 43 42 41)
[*] WA: 41 (41 45 42 41 41 41 41 41 41 40) *
[*]VA: 40 (41 40 40 40)
[*] FL: 39 (42 41 40 39 38 37 37)
[*] IN: 39 (41 40 40 39 36 35 35 35 34 34)
[*] NC: 39 (42 42 41 39)
[*] IL: 38 (41 40 39 38 38 38)
[*] OR: 38 (44 39 38 38)
[*] PA: 38 (41 40 40 38 38 37 36 36 34 34) *
[*] MD: 37 (43 39 39 37 37 37)
[*] AZ: 36 (40? 39? 39 36)
[*] CT: 36 (44 38 38 36 35 35 34 34 34 33 33 32 32 32 32)
[*] MI: 36 (39 41 41 36 37 37 36 36 36 36) *
[*] MN: 36 (40 36 36 36 35 35 35 34)
[*] CO: 35 (41 37 37 35 35 35 ?? 31 31 30) *
[*] GA: 35 (38 37 36 35 34 34 34 34 34 33)
[*] OH: 35 (41 37 36 35)
[*] AR: 34 (46 45 35 34 33 31 31 31 29 29)
[*] NV: 34 (41 38 ?? 34)
[*] TN: 34 (38 ?? ?? 34)
[*] WI: 34 (40 37 37 34 35 30 28 29 29 29) *
[*] HI: 32 (35 34 32 32)
[*] NH: 31 (42 35 33 31 30)
[*] DE: 30 (34 33 32 30 30 29 28 27 26? 24)
[*] SC: 30 (33 33 31 30)
[*] IA: 29 (33 30 31 29 29 29 29 29 29 29 29 29) *
[*] NE: 28 (34 30 28 28 27 27 26 26 25 25)
[*] SD: 22 (30 29 24 22 22 22 21 21 20 20)
[/list]
Cutoffs Unknown

* means that CDR is official in that state.

Notes

For those asking about the removal of the tiers, I'd like to quote Jason himself:
[quote=peace09]
learn from my mistakes
[/quote]

Help contribute by sharing your state's cutoffs!
849 replies
1 viewing
SirAppel
Apr 1, 2025
maxamc
36 minutes ago
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100th post!!!
whwlqkd   7
N an hour ago by K1mchi_
Hello,I am Seohyung Jo,8th grade student from South Korea. I couldn’t think I write many posts. But now,it is my 100th post!!!! As many people do these kind of posts(like 1000th post),I do this post.

Because this is my 100th post,I will share some problems:make 100

Make 100 with these numbers and +,-,*,/,!,^,nCr,nPr
Level 1(easy):20,25,30,35,40
Level 2(medium):1,3,4,5,7
Level 3(hard):1,2,3,4,5
Level 4(extreme):2,3,6,8,9
Level X:2,3,3,4,4
7 replies
whwlqkd
Sunday at 1:12 PM
K1mchi_
an hour ago
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Geometry
smartvong   0
an hour ago
Source: UM Mathematical Olympiad 2024
Let $P$ be a point inside a triangle $ABC$. Let $AP$ meet $BC$ at $A_1$, let $BP$ meet $CA$ at $B_1$, and let $CP$ meet $AB$ at $C_1$. Let $A_2$ be the point such that $A_1$ is the midpoint of $PA_2$, let $B_2$ be the point such that $B_1$ is the midpoint of $PB_2$, and let $C_2$ be the point such that $C_1$ is the midpoint of $PC_2$. Prove that points $A_2, B_2, C_2$ cannot all lie strictly inside the circumcircle of triangle $ABC$.
0 replies
smartvong
an hour ago
0 replies
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angles in triangle
AndrewTom   34
N an hour ago by happypi31415
Source: BrMO 2012/13 Round 2
The point $P$ lies inside triangle $ABC$ so that $\angle ABP = \angle PCA$. The point $Q$ is such that $PBQC$ is a parallelogram. Prove that $\angle QAB = \angle CAP$.
34 replies
AndrewTom
Feb 1, 2013
happypi31415
an hour ago
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Hard to approach it !
BogG   130
N 3 hours ago by Ilikeminecraft
Source: Swiss Imo Selection 2006
Let $\triangle ABC$ be an acute-angled triangle with $AB \not= AC$. Let $H$ be the orthocenter of triangle $ABC$, and let $M$ be the midpoint of the side $BC$. Let $D$ be a point on the side $AB$ and $E$ a point on the side $AC$ such that $AE=AD$ and the points $D$, $H$, $E$ are on the same line. Prove that the line $HM$ is perpendicular to the common chord of the circumscribed circles of triangle $\triangle ABC$ and triangle $\triangle ADE$.
130 replies
BogG
May 25, 2006
Ilikeminecraft
3 hours ago
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A game with balls and boxes
egxa   5
N 3 hours ago by compoly2010
Source: Turkey JBMO TST 2023 Day 1 P4
Initially, Aslı distributes $1000$ balls to $30$ boxes as she wishes. After that, Aslı and Zehra make alternated moves which consists of taking a ball in any wanted box starting with Aslı. One who takes the last ball from any box takes that box to herself. What is the maximum number of boxes can Aslı guarantee to take herself regardless of Zehra's moves?
5 replies
egxa
Apr 30, 2023
compoly2010
3 hours ago
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Two lines meet on semicircle
va2010   87
N 3 hours ago by Ilikeminecraft
Source: 2015 ISL G3
Let $ABC$ be a triangle with $\angle{C} = 90^{\circ}$, and let $H$ be the foot of the altitude from $C$. A point $D$ is chosen inside the triangle $CBH$ so that $CH$ bisects $AD$. Let $P$ be the intersection point of the lines $BD$ and $CH$. Let $\omega$ be the semicircle with diameter $BD$ that meets the segment $CB$ at an interior point. A line through $P$ is tangent to $\omega$ at $Q$. Prove that the lines $CQ$ and $AD$ meet on $\omega$.
87 replies
1 viewing
va2010
Jul 7, 2016
Ilikeminecraft
3 hours ago
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something...
SunnyEvan   2
N 3 hours ago by SunnyEvan
Source: unknown
Try to prove : $$ \sum csc^{20} \frac{2^{i} \pi}{7} csc^{23} \frac{2^{j}\pi }{7} csc^{2023} \frac{2^{k} \pi}{7} $$is a rational number.
Where $ (i,j,k)=(1,2,3) $ and other permutations.
2 replies
SunnyEvan
May 5, 2025
SunnyEvan
3 hours ago
J
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USAMO 2002 Problem 2
MithsApprentice   34
N 4 hours ago by Giant_PT
Let $ABC$ be a triangle such that
\[ \left( \cot \dfrac{A}{2} \right)^2 + \left( 2\cot \dfrac{B}{2} \right)^2 + \left( 3\cot \dfrac{C}{2} \right)^2 = \left( \dfrac{6s}{7r} \right)^2, \]
where $s$ and $r$ denote its semiperimeter and its inradius, respectively. Prove that triangle $ABC$ is similar to a triangle $T$ whose side lengths are all positive integers with no common divisors and determine these integers.
34 replies
MithsApprentice
Sep 30, 2005
Giant_PT
4 hours ago
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Another config geo with concurrent lines
a_507_bc   17
N 4 hours ago by Rayvhs
Source: BMO SL 2023 G5
Let $ABC$ be a triangle with circumcenter $O$. Point $X$ is the intersection of the parallel line from $O$ to $AB$ with the perpendicular line to $AC$ from $C$. Let $Y$ be the point where the external bisector of $\angle BXC$ intersects with $AC$. Let $K$ be the projection of $X$ onto $BY$. Prove that the lines $AK, XO, BC$ have a common point.
17 replies
a_507_bc
May 3, 2024
Rayvhs
4 hours ago
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Nice sequence problem.
mathlover1231   1
N 4 hours ago by vgtcross
Source: Own
Scientists found a new species of bird called “N-coloured rainbow”. They also found out 3 interesting facts about the bird’s life: 1) every day, N-coloured rainbow is coloured in one of N colors.
2) every day, the color is different from yesterday (not every previous day, just yesterday).
3) there are no four days i, j, k, l in the bird’s life such that i<j<k<l with colours a, b, c, d respectively for which a=c ≠ b=d.
Find the greatest possible age (in days) of this bird as a function of N.
1 reply
mathlover1231
Apr 10, 2025
vgtcross
4 hours ago
J
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Three circles are concurrent
Twoisaprime   23
N 5 hours ago by Curious_Droid
Source: RMM 2025 P5
Let triangle $ABC$ be an acute triangle with $AB<AC$ and let $H$ and $O$ be its orthocenter and circumcenter, respectively. Let $\Gamma$ be the circle $BOC$. The line $AO$ and the circle of radius $AO$ centered at $A$ cross $\Gamma$ at $A’$ and $F$, respectively. Prove that $\Gamma$ , the circle on diameter $AA’$ and circle $AFH$ are concurrent.
Proposed by Romania, Radu-Andrew Lecoiu
23 replies
Twoisaprime
Feb 13, 2025
Curious_Droid
5 hours ago
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Alcumus specs
YeohZY   5
N Apr 29, 2025 by PikaPika999
Hi, can I ask about how Alcumus gives you points? (I mean the number on the red/orange/green/blue line on top that gains once you get correct answers. I'll just call it the score). I want to get my score up to 100, but I always can't and get stuck at like 98 or sth. Why is this so, and also how does alcumus make that "score" higher?
5 replies
YeohZY
Apr 27, 2025
PikaPika999
Apr 29, 2025
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Alcumus specs
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Reveal topic tags
Alcumus
Specifications
question
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YeohZY
6 posts
YeohZY
#1 h  Apr 27, 2025, 3:50 AM • 1 Y
Y by PikaPika999
Hi, can I ask about how Alcumus gives you points? (I mean the number on the red/orange/green/blue line on top that gains once you get correct answers. I'll just call it the score). I want to get my score up to 100, but I always can't and get stuck at like 98 or sth. Why is this so, and also how does alcumus make that "score" higher?
This post has been edited 1 time. Last edited by YeohZY, Apr 28, 2025, 8:16 AM
Reason: originally the post was incredibly unclear
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aidan0626
1911 posts
aidan0626
#2 h  Apr 27, 2025, 5:59 AM • 1 Y
Y by PikaPika999
what do you mean by points?
rating gain slows down as your rating gets higher, and solving easy problems doesn't make your rating go up as much
also if you're doing prealg your rating legit goes up 10x slower than like any other subject
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PikaPika999
1783 posts
PikaPika999
#3 h  Apr 27, 2025, 11:05 PM
Y by
YeohZY wrote:
Hi, can I ask about how Alcumus gives you points? Many times I do a lot of questions and it doesn't give me any points. I just wanted to ask this because it keeps bugging me.

If the "points" are rating, then quick question: "Which topic are you doing?" Because if the topic is Prealgebra, then yeah. That makes sense. Getting 10 questions right in prealgebra brings your rating up by like 0.1 and then getting one wrong brings it down by 50. :skull:
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NovaFrost
18 posts
NovaFrost
#5 h  Apr 29, 2025, 3:46 PM • 1 Y
Y by PikaPika999
lol fr that's actually true
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Unicode_Master03B8
263 posts
Unicode_Master03B8
#6 h  Apr 29, 2025, 3:54 PM • 1 Y
Y by PikaPika999
/req move to Alcumus forum

I think they are referring to the bar in the top right that appears while playing Alcumus. If you want to get this bar to 100, you have to do a lot of problems in the same focus.
This post has been edited 1 time. Last edited by Unicode_Master03B8, Apr 29, 2025, 3:54 PM
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PikaPika999
1783 posts
PikaPika999
#7 h  Apr 29, 2025, 7:23 PM
Y by
Unicode_Master03B8 wrote:
/req move to Alcumus forum

I think they are referring to the bar in the top right that appears while playing Alcumus. If you want to get this bar to 100, you have to do a lot of problems in the same focus.

took me 1500 correct questions to get reciprocals to 100 :P
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