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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
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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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Circle is tangent to circumcircle and incircle
ABCDE   75
N 23 minutes ago by ohiorizzler1434
Source: 2016 ELMO Problem 6
Elmo is now learning olympiad geometry. In triangle $ABC$ with $AB\neq AC$, let its incircle be tangent to sides $BC$, $CA$, and $AB$ at $D$, $E$, and $F$, respectively. The internal angle bisector of $\angle BAC$ intersects lines $DE$ and $DF$ at $X$ and $Y$, respectively. Let $S$ and $T$ be distinct points on side $BC$ such that $\angle XSY=\angle XTY=90^\circ$. Finally, let $\gamma$ be the circumcircle of $\triangle AST$.

(a) Help Elmo show that $\gamma$ is tangent to the circumcircle of $\triangle ABC$.

(b) Help Elmo show that $\gamma$ is tangent to the incircle of $\triangle ABC$.

James Lin
75 replies
ABCDE
Jun 24, 2016
ohiorizzler1434
23 minutes ago
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Number of divisors divides n^2 + 1
dolphinday   3
N an hour ago by sansgankrsngupta
Source: Krishna Pothapragada
Let $n$ be an even integer, and let $d(n)$ denote the number of (positive) divisors of $n$.
Prove that $d(n)$ does not divide $n^2+1$.

Written by Krishna Pothapragada
3 replies
+1 w
dolphinday
Jan 10, 2024
sansgankrsngupta
an hour ago
J
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Own made functional equation
Primeniyazidayi   5
N an hour ago by JARP091
Source: own(probably)
Find all functions $f:R \rightarrow R$ such that $xf(x^2+2f(y)-yf(x))=f(x)^3-f(y)(f(x^2)-2f(x))$ for all $x,y \in \mathbb{R}$
5 replies
Primeniyazidayi
May 26, 2025
JARP091
an hour ago
J
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Iran TST P6
luutrongphuc   4
N 2 hours ago by AblonJ
Find all function $f: \mathbb{R^+} \to \mathbb{R^+}$ such that:
$$f \left( f(f(xy))+x^2\right)=f(y)f(x)-f(y)f(x+y)$$
4 replies
luutrongphuc
May 26, 2025
AblonJ
2 hours ago
J
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Brilliant Problem
M11100111001Y1R   7
N 2 hours ago by flower417477
Source: Iran TST 2025 Test 3 Problem 3
Find all sequences \( (a_n) \) of natural numbers such that for every pair of natural numbers \( r \) and \( s \), the following inequality holds:
\[ \frac{1}{2} < \frac{\gcd(a_r, a_s)}{\gcd(r, s)} < 2 \]
7 replies
M11100111001Y1R
May 27, 2025
flower417477
2 hours ago
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In Cyclic Quadrilateral ABCD, find AB^2+BC^2-CD^2-AD^2
Darealzolt   1
N 2 hours ago by Beelzebub
Source: KTOM April 2025 P8
Given Cyclic Quadrilateral \(ABCD\) with an area of \(2025\), with \(\angle ABC = 45^{\circ}\). If \( 2AC^2 = AB^2+BC^2+CD^2+DA^2\), Hence find the value of \(AB^2+BC^2-CD^2-DA^2\).
1 reply
Darealzolt
Today at 4:10 AM
Beelzebub
2 hours ago
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Another FE
M11100111001Y1R   3
N 2 hours ago by AndreiVila
Source: Iran TST 2025 Test 2 Problem 3
Find all functions $f: \mathbb{R}^+ \to \mathbb{R}^+$ such that for all $x,y>0$ we have:
$$f(f(f(xy))+x^2)=f(y)(f(x)-f(x+y))$$
3 replies
1 viewing
M11100111001Y1R
Yesterday at 8:03 AM
AndreiVila
2 hours ago
J
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Iran TST Starter
M11100111001Y1R   4
N 2 hours ago by flower417477
Source: Iran TST 2025 Test 1 Problem 1
Let \( a_n \) be a sequence of positive real numbers such that for every \( n > 2025 \), we have:
\[ a_n = \max_{1 \leq i \leq 2025} a_{n-i} - \min_{1 \leq i \leq 2025} a_{n-i} \]Prove that there exists a natural number \( M \) such that for all \( n > M \), the following holds:
\[ a_n < \frac{1}{1404} \]
4 replies
M11100111001Y1R
May 27, 2025
flower417477
2 hours ago
J
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Inequality with abc=1
tenplusten   10
N 3 hours ago by Adywastaken
Source: JBMO 2011 Shortlist A7
$\boxed{\text{A7}}$ Let $a,b,c$ be positive reals such that $abc=1$.Prove the inequality $\sum\frac{2a^2+\frac{1}{a}}{b+\frac{1}{a}+1}\geq 3$
10 replies
tenplusten
May 15, 2016
Adywastaken
3 hours ago
J
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A game of cutting
k.vasilev   11
N 3 hours ago by NicoN9
Source: All-Russian Olympiad 2019 grade 10 problem 2
Pasha and Vova play the following game, making moves in turn; Pasha moves first. Initially, they have a large piece of plasticine. By a move, Pasha cuts one of the existing pieces into three(of arbitrary sizes), and Vova merges two existing pieces into one. Pasha wins if at some point there appear to be $100$ pieces of equal weights. Can Vova prevent Pasha's win?
11 replies
k.vasilev
Apr 23, 2019
NicoN9
3 hours ago
J
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Registrations Open for IOQM Level Up Test 2025!
oly01230   0
Today at 5:13 AM
Registrations Open for IOQM Level Up Test 2025!

Hello everyone!

Are you a middle or high school student passionate about math competitions like IOQM, NMTC, RMO, and beyond? Do you want to benchmark your preparation, identify your strengths, and get mentored by some of the best minds in Olympiad math?

Then you should definitely check out the IOQM Level Up Test, organized by Narayana Prodigy – a platform dedicated to identifying and mentoring the top young math talent in the country.

- Register here: https://ioqm.co.in/

What is the IOQM Level Up Test?
IOQM Level Up is a nationwide simulation test built on the latest IOQM trends. It is designed for students of Classes 8 to 12 who aim to crack the IOQM, qualify for RMO, and ultimately represent India at the IMO. This is more than just a test – it’s a gateway to deeper mentorship, curated resources, and Prodigy workshops.

Why You Should Participate
- Real IOQM-level experience: Designed by Olympiad experts and past IOQM/RMO mentors
- Detailed test analysis: Understand your strengths and areas of improvement
- Top scorer mentorship: Shortlisted students get access to advanced training sessions
- Access to learning resources: Problem sets, video solutions, and more
- Stand a chance to join the elite Narayana Prodigy program

Test Details
- Test Date: 22 June 2025
- Duration: 3 Hours
- Mode: Online & Offline (select Narayana Centres)
- For: Students of Classes 8 to 12 aspiring for IOQM 2025
- Fees: Rs. 50 for 4 Mock Tests complete with SWOT analysis and National benchmarking Report

- If you're already preparing for Olympiads, this is the test you shouldn’t miss!

About Narayana Prodigy
Narayana Prodigy is the Olympiad division of Narayana Group, known for training some of the brightest students for JEE, NEET, and Science/Math Olympiads. We believe in nurturing academic prodigies from an early stage through workshops, mentoring, and customized learning paths.

Want to Know More?
Explore more about our Olympiad programs and IOQM mentoring initiative:
- https://prodigy.narayanagroup.com
- For queries: support.prodigy@narayanagroup.com

Take the first step toward your Olympiad journey. Register now and Level Up!
0 replies
oly01230
Today at 5:13 AM
0 replies
J
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Perfect Square Dice
asp211   69
N Today at 4:55 AM by ohiorizzler1434
Source: 2019 AIME II #4
A standard six-sided fair die is rolled four times. The probability that the product of all four numbers rolled is a perfect square is $\tfrac{m}{n}$, where $m$ and $n$ are relatively prime positive integers. Find $m+n$.
69 replies
asp211
Mar 22, 2019
ohiorizzler1434
Today at 4:55 AM
J
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Mustang Math Recruitment is Open!
MustangMathTournament   7
N Today at 4:54 AM by ohiorizzler1434
The Interest Form for joining Mustang Math is open!

Hello all!

We're Mustang Math, and we are currently recruiting for the 2025-2026 year! If you are a high school or college student and are passionate about promoting an interest in competition math to younger students, you should strongly consider filling out the following form: https://link.mustangmath.com/join. Every member in MM truly has the potential to make a huge impact, no matter your experience!

About Mustang Math

Mustang Math is a nonprofit organization of high school and college volunteers that is dedicated to providing middle schoolers access to challenging, interesting, fun, and collaborative math competitions and resources. Having reached over 4000 U.S. competitors and 1150 international competitors in our first six years, we are excited to expand our team to offer our events to even more mathematically inclined students.

PROJECTS
We have worked on various math-related projects. Our annual team math competition, Mustang Math Tournament (MMT) recently ran. We hosted 8 in-person competitions based in Washington, NorCal, SoCal, Illinois, Georgia, Massachusetts, Nevada and New Jersey, as well as an online competition run nationally. In total, we had almost 900 competitors, and the students had glowing reviews of the event. MMT International will once again be running later in August, and with it, we anticipate our contest to reach over a thousand students.

In our classes, we teach students math in fun and engaging math lessons and help them discover the beauty of mathematics. Our aspiring tech team is working on a variety of unique projects like our website and custom test platform. We also have a newsletter, which, combined with our social media presence, helps to keep the mathematics community engaged with cool puzzles, tidbits, and information about the math world! Our design team ensures all our merch and material is aesthetically pleasing.

Some highlights of this past year include 1000+ students in our classes, AMC10 mock with 150+ participants, our monthly newsletter to a subscriber base of 6000+, creating 8 designs for 800 pieces of physical merchandise, as well as improving our custom website (mustangmath.com, 20k visits) and test-taking platform (comp.mt, 6500+ users).

Why Join Mustang Math?

As a non-profit organization on the rise, there are numerous opportunities for volunteers to share ideas and suggest projects that they are interested in. Through our organizational structure, members who are committed have the opportunity to become a part of the leadership team. Overall, working in the Mustang Math team is both a fun and fulfilling experience where volunteers are able to pursue their passion all while learning how to take initiative and work with peers. We welcome everyone interested in joining!

More Information

To learn more, visit https://link.mustangmath.com/RecruitmentInfo. If you have any questions or concerns, please email us at contact@mustangmath.com.

https://link.mustangmath.com/join
7 replies
MustangMathTournament
May 24, 2025
ohiorizzler1434
Today at 4:54 AM
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Frustration with Olympiad Geo
gulab_jamun   12
N Today at 2:32 AM by ohiorizzler1434
Ok, so right now, I am doing the EGMO book by Evan Chen, but when it comes to problems, there are some that just genuinely frustrate me and I don't know how to deal with them. For example, I've spent 1.5 hrs on the second to last question in chapter 2, and used all the hints, and I still am stuck. It just frustrates me incredibly. Any tips on managing this? (or.... am I js crashing out too much?)
12 replies
gulab_jamun
Yesterday at 2:13 PM
ohiorizzler1434
Today at 2:32 AM
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AIME/AMC 10 Overlap and Preparation
AlphaBetaTheta   2
N Jan 2, 2011 by MCL
I've been trying to prepare for the amc 10 to qualify for the aime. I've heard that 1-5 on aime should be done for practice. Which years on the aime would help me the most in my preparation?
2 replies
AlphaBetaTheta
Jan 2, 2011
MCL
Jan 2, 2011
J
AIME/AMC 10 Overlap and Preparation
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Reveal topic tags
AMC
AIME
AMC 10
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AlphaBetaTheta
182 posts
AlphaBetaTheta
#1 h  Jan 2, 2011, 10:18 PM • 2 Y
Y by Adventure10, Mango247
I've been trying to prepare for the amc 10 to qualify for the aime. I've heard that 1-5 on aime should be done for practice. Which years on the aime would help me the most in my preparation?
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luie1168e
1295 posts
luie1168e
#2 h  Jan 2, 2011, 10:42 PM • 2 Y
Y by Adventure10, Mango247
AlphaBetaTheta wrote:
I've been trying to prepare for the amc 10 to qualify for the aime. I've heard that 1-5 on aime should be done for practice. Which years on the aime would help me the most in my preparation?

In my opinion,in the time where aime 2 doesn't exist,the 1-5 problem is harder, but i think all the kind of problem would help also... but i think doing the harder AMC 12 problem might help because sometime #15-20 in AMC 12 meant to #20-25 AMC 10!
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MCL
1259 posts
MCL
#3 h  Jan 2, 2011, 11:03 PM • 3 Y
Y by Adventure10, Mango247, and 1 other user
Try the AIME of 1989. I managed to get the first ten questions right because they were much easier than the average AIME.
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