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Contests & Programs AMC and other contests, summer programs, etc.
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k a April Highlights and 2025 AoPS Online Class Information
jlacosta   0
Apr 2, 2025
Spring is in full swing and summer is right around the corner, what are your plans? At AoPS Online our schedule has new classes starting now through July, so be sure to keep your skills sharp and be prepared for the Fall school year! Check out the schedule of upcoming classes below.

WOOT early bird pricing is in effect, don’t miss out! If you took MathWOOT Level 2 last year, no worries, it is all new problems this year! Our Worldwide Online Olympiad Training program is for high school level competitors. AoPS designed these courses to help our top students get the deep focus they need to succeed in their specific competition goals. Check out the details at this link for all our WOOT programs in math, computer science, chemistry, and physics.

Looking for summer camps in math and language arts? Be sure to check out the video-based summer camps offered at the Virtual Campus that are 2- to 4-weeks in duration. 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 events:
[list][*]April 3rd (Webinar), 4pm PT/7:00pm ET, Learning with AoPS: Perspectives from a Parent, Math Camp Instructor, and University Professor
[*]April 8th (Math Jam), 4:30pm PT/7:30pm ET, 2025 MATHCOUNTS State Discussion
April 9th (Webinar), 4:00pm PT/7:00pm ET, Learn about Video-based Summer Camps at the Virtual Campus
[*]April 10th (Math Jam), 4:30pm PT/7:30pm ET, 2025 MathILy and MathILy-Er Math Jam: Multibackwards Numbers
[*]April 22nd (Webinar), 4:00pm PT/7:00pm ET, Competitive Programming at AoPS (USACO).[/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
Apr 2, 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
9 Will I make AMO?
sus_rbo   3
N 8 minutes ago by SpeedCuber7
Hi imagien_bad, I got a 11 on AIME I 2025 what is my chance to make USAMO 2025? (i did not do 12A or 12B btw)
3 replies
sus_rbo
3 hours ago
SpeedCuber7
8 minutes ago
f(a)=a,-a
Physicsknight   20
N 19 minutes ago by atdaotlohbh
Source: RMMSL-19 A1
Determine all the functions $f:\mathbb R\mapsto\mathbb R$ satisfies the equation
$f(a^2 +ab+ f(b^2))=af(b)+b^2+ f(a^2)\,\forall a,b\in\mathbb R $
20 replies
Physicsknight
May 27, 2020
atdaotlohbh
19 minutes ago
For positive integers \( a, b, c \), find all possible positive integer values o
Jackson0423   7
N 25 minutes ago by blug
For positive integers \( a, b, c \), find all possible positive integer values of
\[
\frac{a}{b} + \frac{b}{c} + \frac{c}{a}.
\]
7 replies
Jackson0423
Today at 8:35 AM
blug
25 minutes ago
combinatorics
gggzul   0
27 minutes ago
Source: local competition
Does there exist an infinite set of positive integers $S$ with the following property: the sum of the elements of any finite subset of $S$ is not a power of an integer with an exponent greater than 1?
0 replies
gggzul
27 minutes ago
0 replies
thank you
Piwbo   3
N 30 minutes ago by Safal
Let $p_n$ be the n-th prime number in increasing order for $n\geq 1$. Prove that there exists a sequence of distinct prime numbers $q_n$ satisfying $q_1+q_2+...+q_n=p_n$ for all $n\geq 1 $
3 replies
Piwbo
Apr 10, 2025
Safal
30 minutes ago
Symmetric inequality
Natrium   0
31 minutes ago
Source: Own
Prove that for all $a,b,c>0$:

$$\sum_{\text{cyc}}\frac{36a^2+12ab+12bc+12ca}{28a^2+b^2+c^2+14ab+14bc+14ca}\le 3$$
0 replies
Natrium
31 minutes ago
0 replies
The sum of reciproal of the product of coprime pairs
maomaodog   2
N 36 minutes ago by maomaodog
Let n be a positive integer. Consider all the pairs (a,b) such that

- a,b≤n
- a+b>n
- a and b are coprime.

Find the sum of 1/ab for all of these pairs (a,b) in terms of n.
2 replies
maomaodog
an hour ago
maomaodog
36 minutes ago
Interesting Inequality
Jackson0423   0
43 minutes ago
Let \( a_1, a_2, \dots, a_{2024} \) be real numbers that satisfy the condition:
\[
a_i \cdot a_j \geq i^2 - j^2 \quad \text{for all} \quad 1 \leq i \leq j \leq 2024.
\]What is the minimum value of \( a_1 + a_2 + \dots + a_{2024} \)?
0 replies
Jackson0423
43 minutes ago
0 replies
Geometry marathon
HoRI_DA_GRe8   844
N an hour ago by aidenkim119
Ok so there's been no geo marathon here for more than 2 years,so lets start one,rules remain same.
1st problem.
Let $PQRS$ be a cyclic quadrilateral with $\angle PSR=90°$ and let $H$ and $K$ be the feet of altitudes from $Q$ to the lines $PR$ and $PS$,.Prove $HK$ bisects $QS$.
P.s._eeezy ,try without ss line.
844 replies
HoRI_DA_GRe8
Sep 5, 2021
aidenkim119
an hour ago
Scary Binomial Coefficient Sum
EpicBird08   41
N 2 hours ago by zoinkers
Source: USAMO 2025/5
Determine, with proof, all positive integers $k$ such that $$\frac{1}{n+1} \sum_{i=0}^n \binom{n}{i}^k$$is an integer for every positive integer $n.$
41 replies
+1 w
EpicBird08
Mar 21, 2025
zoinkers
2 hours ago
Interesting inequality
A_E_R   2
N 2 hours ago by A_E_R
Let a,b,c,d are positive real numbers, if the following inequality holds ab^2+ac^2>=5bcd. Find the minimum value of explanation: (a^2+b^2+c^2+d^2)(1/a^2+1/b^2+1/c^2+1/d^2)
2 replies
A_E_R
Today at 9:41 AM
A_E_R
2 hours ago
smt format pmo...?
alcumusftwgrind   10
N 2 hours ago by alcumusftwgrind
they cant be serious on the 4th one...

UGHHHHHHHHHHHHHHHHHHHHH this better not happen on general or I'm literally gonna quit the test and go play ultimate ??????
10 replies
alcumusftwgrind
Yesterday at 11:31 PM
alcumusftwgrind
2 hours ago
one cyclic formed by two cyclic
CrazyInMath   10
N 2 hours ago by InterLoop
Source: EGMO 2025/3
Let $ABC$ be an acute triangle. Points $B, D, E$, and $C$ lie on a line in this order and satisfy $BD = DE = EC$. Let $M$ and $N$ be the midpoints of $AD$ and $AE$, respectively. Suppose triangle $ADE$ is acute, and let $H$ be its orthocentre. Points $P$ and $Q$ lie on lines $BM$ and $CN$, respectively, such that $D, H, M,$ and $P$ are concyclic and pairwise different, and $E, H, N,$ and $Q$ are concyclic and pairwise different. Prove that $P, Q, N,$ and $M$ are concyclic.
10 replies
+1 w
CrazyInMath
5 hours ago
InterLoop
2 hours ago
PROM^2 for Girls 2025
mathisfun17   26
N 3 hours ago by fossasor
Hi everyone!

The Princeton International School of Math and Science (PRISMS) Math Team is delighted that $PROM^2$ for Girls, PRISMS Online Math Meet for Girls, is happening this spring! https://www.prismsus.org/events/prom/home/index

We warmly invite all middle school girls to join us! This is a fantastic opportunity for young girls to connect with others interested in math as well as prepare for future math contests.

This contest will take place online from 12:00 pm to 3:00 pm EST on Saturday, April 26th, 2025.

The competition will include a team and individual round as well as activities like origami. You can see a detailed schedule here. https://prismsus.org/events/prom/experience/schedule.

Registration is FREE, there are cash prizes for participants who place in the top 10 and cool gifts for all participants.

1st place individual: $500 cash
2nd place individual: $300 cash
3rd place individual: $100 cash
4th-10th place individual: $50 cash each

Some FAQs:
Q: How difficult are the questions?
A: The problem difficulty is around AMC 8 or Mathcounts level.

Q: Are there any example problems?
A: You can find some archived here: https://www.prismsus.org/events/prom/achieve/achieve

Registration is open now. https://www.prismsus.org/events/prom/register/register. Email us at prom2@prismsus.org with any questions.

The PRISMS Peregrines Math Team welcomes you!
26 replies
mathisfun17
Feb 22, 2025
fossasor
3 hours ago
Kelvin the Frog returns!
BOGTRO   53
N Dec 28, 2023 by sbicecream
Source: Mock AIME
We are pleased to announce that Kelvin the Frog has graciously signed a lucrative contract, finally allowing us to produce our mock AIME. Among other duties (such as taking a vacation from his Cartesian plane), Kelvin the Frog will be building various residences, constructing several infinite series, and playing with his friends Alex the Kat, Steven the Alpaca, AJ the Dennis the Menace, the Great Sabeenee, and the entire cast of unforgettable AAST characters.

As is typical for mock AIMEs, we follow the format of the actual AIME. There are 15 problems, roughly ordered by difficulty, to be solved over a continuous period of 3 hours. Obviously, this is run on the honor system. All answers are nonnegative integers ranging from 000 to 999, but due to computers deleting leading zeros anyway, they are not necessary to include (so 7, 07, and 007 are all acceptable answers).

This test will be released this weekend, on either late-ish Saturday or early-ish Sunday. This is because the test will (hopefully) be physically administered to the BCA math team this Saturday, so releasing it beforehand kind of defeats the purpose. Because this weekend is the last one before the actual AIME, submissions will stay open at least through (shortly before) the AIME II. You will, however, receive your score shortly after submission, and you are welcome to request solutions to specific problems. Obviously, you should not discuss the problems among people you cannot verify already submitted until otherwise announced.

As usual, there is a very distinct possibility that questions will be ambiguous, poorly worded, or just plain wrong. If you are certain that a problem does not have a valid answer (e.g. asks for $\sqrt{2}$ in the form $\frac{m}{n}$, leads to a negative or 4-digit answer, asks for $\sqrt{n}$ where $n$ is not squarefree, etc.), you should submit "1000" and an explanatory note. All answers that are not nonnegative integers with at most 3 digits besides 1000 will be immediately discarded, including submissions such as "seven" or "7\". Your answers are scored by program, so it is very important that you submit the ones you intend to. In the case of an ambiguity, pick any interpretation that leads to a valid answer, and submit that answer with an explanatory note.

After official answers/solutions and scores are released (which will be slightly after the AIME II) you will have an opportunity to protest. An acceptable protest must prove that your answer is undeniably correct (e.g. the burden of proof falls upon you), or that there is an alternate interpretation of the question leading to your answer. If your protest is accepted and you submitted the answer in the protest, your score (along with anyone who submitted that answer) will be incremented. You cannot, however, lose points for someone else successfully protesting a question (e.g. our answers will always be given credit).

There will be a google submission form available to submit your answers. We prefer that you use this form because it will contain some brief survey questions (e.g. "which problem did you find most difficult" and whatnot), but it is not required. You can also simply PM me your answers. Again, you will receive your score as soon as you are graded, and you can ask for specific solutions (the earlier you do this, the more likely you are to receive outlines rather than rigorous solutions however).

You do not have to sign up to take this, nor do you have to take it if you sign up. However, if you believe that you will take the test under contest conditions, signing up would be nice so we have a general idea of the number of participants.

On a completely unrelated note, I saved my 7000th post for this so you should all take it ;)
53 replies
BOGTRO
Mar 3, 2014
sbicecream
Dec 28, 2023
Kelvin the Frog returns!
G H J
G H BBookmark kLocked kLocked NReply
Source: Mock AIME
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countingkg
295 posts
#40 • 1 Y
Y by Adventure10
Liked the test. Didn't have that much time to spend on it (around 1.5 hours), but that's my own fault.
Z K Y
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BOGTRO
5818 posts
#41 • 1 Y
Y by Adventure10
Bumping because the forum will close relatively soon.
Z K Y
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Konigsberg
2206 posts
#42 • 2 Y
Y by Adventure10, Mango247
Are we going to get our scores before the deadline, or we should wait until the deadline before we can receive feedback?

Thanks for these nice problems! (although they are quite too long and wordily-phrased)
Z K Y
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BOGTRO
5818 posts
#43 • 2 Y
Y by Adventure10, Mango247
Konigsberg wrote:
Are we going to get our scores before the deadline, or we should wait until the deadline before we can receive feedback?

Your scores are sent to you as soon as I grade your submission, which is usually less than 24 hours after you submit. I don't, however, have a submission from you.
________________________________________________________________________________________________________________________
Anyhow, since this forum will probably close down soon, here are the preliminary scores (already sent to participants; ties resolved by latest question correct):
  • hamup1: 3
  • ahaanomegas: 4
  • guilt: 5
  • ksun48: 10
  • admin25: 10
  • countingkg: 11
  • ABCDE: 11
  • Naysh: 12
Thanks to everyone who submitted! You may still submit up through the AIME II, and if you've already taken the test and would like solutions to specific problems you can ask me (request may or may not be granted) by PM.
Z K Y
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BOGTRO
5818 posts
#44 • 1 Y
Y by Adventure10
Bumping this up; submissions are still open until the AIME II.
Z K Y
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Royalreter1
1913 posts
#45 • 2 Y
Y by Adventure10, Mango247
Can the results/solutions come out now that AIME II is over?
And I do not believe I received my score after I submitted...
Z K Y
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GameMaster402
1970 posts
#46 • 2 Y
Y by Adventure10, Mango247
Uh where are the answers to this?
Z K Y
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Juno
4044 posts
#47 • 2 Y
Y by Adventure10, Mango247
Why did you bump this thread?
This post has been edited 1 time. Last edited by Juno, May 27, 2020, 1:26 AM
Reason: Thanks to #49 for bumping a three-year-old thread so I could revise my terminology.
Z K Y
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GameMaster402
1970 posts
#48 • 1 Y
Y by Adventure10
Because I did this yesterday and don't want a complete waste of time lol
Z K Y
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ec1117
19 posts
#49
Y by
sorry for the bump again but does anyone have solutions or answers to these?
Z K Y
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P_Groudon
867 posts
#50
Y by
Oh yeah, digging through some notes, I remember working on these problems with a buddy and we got some answers:

Could be wrong

I don't think we ever managed to get #15
This post has been edited 3 times. Last edited by P_Groudon, Dec 14, 2023, 12:07 AM
Z K Y
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sbicecream
51 posts
#51
Y by
So, what did I miss?
Z K Y
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P_Groudon
867 posts
#53
Y by
1. People bump threads that haven't been posted on in years all the time
2. Kelvin the Frog is a character BOGTRO (who no longer goes on this site AFAIK) uses in many of his mocks
Z K Y
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parmenides51
30630 posts
#54
Y by
all problems have been posted in separate threads in HSM,
I just created the related post collection

here

enjoy / start solving

more USA mocks here (also mentioned here)
more AIME mocks here,
more User-created contests here (contains all above)
This post has been edited 1 time. Last edited by parmenides51, Dec 17, 2023, 9:05 AM
Z K Y
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sbicecream
51 posts
#55
Y by
BOGTRO wrote:
We are pleased to announce that Kelvin the Frog has graciously signed a lucrative contract, finally allowing us to produce our mock AIME. Among other duties (such as taking a vacation from his Cartesian plane), Kelvin the Frog will be building various residences, constructing several infinite series, and playing with his friends Alex the Kat, Steven the Alpaca, AJ the Dennis the Menace, the Great Sabeenee, and the entire cast of unforgettable AAST characters.

As is typical for mock AIMEs, we follow the format of the actual AIME. There are 15 problems, roughly ordered by difficulty, to be solved over a continuous period of 3 hours. Obviously, this is run on the honor system. All answers are nonnegative integers ranging from 000 to 999, but due to computers deleting leading zeros anyway, they are not necessary to include (so 7, 07, and 007 are all acceptable answers).

This test will be released this weekend, on either late-ish Saturday or early-ish Sunday. This is because the test will (hopefully) be physically administered to the BCA math team this Saturday, so releasing it beforehand kind of defeats the purpose. Because this weekend is the last one before the actual AIME, submissions will stay open at least through (shortly before) the AIME II. You will, however, receive your score shortly after submission, and you are welcome to request solutions to specific problems. Obviously, you should not discuss the problems among people you cannot verify already submitted until otherwise announced.

As usual, there is a very distinct possibility that questions will be ambiguous, poorly worded, or just plain wrong. If you are certain that a problem does not have a valid answer (e.g. asks for $\sqrt{2}$ in the form $\frac{m}{n}$, leads to a negative or 4-digit answer, asks for $\sqrt{n}$ where $n$ is not squarefree, etc.), you should submit "1000" and an explanatory note. All answers that are not nonnegative integers with at most 3 digits besides 1000 will be immediately discarded, including submissions such as "seven" or "7\". Your answers are scored by program, so it is very important that you submit the ones you intend to. In the case of an ambiguity, pick any interpretation that leads to a valid answer, and submit that answer with an explanatory note.

After official answers/solutions and scores are released (which will be slightly after the AIME II) you will have an opportunity to protest. An acceptable protest must prove that your answer is undeniably correct (e.g. the burden of proof falls upon you), or that there is an alternate interpretation of the question leading to your answer. If your protest is accepted and you submitted the answer in the protest, your score (along with anyone who submitted that answer) will be incremented. You cannot, however, lose points for someone else successfully protesting a question (e.g. our answers will always be given credit).

There will be a google submission form available to submit your answers. We prefer that you use this form because it will contain some brief survey questions (e.g. "which problem did you find most difficult" and whatnot), but it is not required. You can also simply PM me your answers. Again, you will receive your score as soon as you are graded, and you can ask for specific solutions (the earlier you do this, the more likely you are to receive outlines rather than rigorous solutions however).

You do not have to sign up to take this, nor do you have to take it if you sign up. However, if you believe that you will take the test under contest conditions, signing up would be nice so we have a general idea of the number of participants.

On a completely unrelated note, I saved my 7000th post for this so you should all take it ;)

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