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k a My Retirement & New Leadership at AoPS
rrusczyk   1571
N Mar 26, 2025 by SmartGroot
I write today to announce my retirement as CEO from Art of Problem Solving. When I founded AoPS 22 years ago, I never imagined that we would reach so many students and families, or that we would find so many channels through which we discover, inspire, and train the great problem solvers of the next generation. I am very proud of all we have accomplished and I’m thankful for the many supporters who provided inspiration and encouragement along the way. I'm particularly grateful to all of the wonderful members of the AoPS Community!

I’m delighted to introduce our new leaders - Ben Kornell and Andrew Sutherland. Ben has extensive experience in education and edtech prior to joining AoPS as my successor as CEO, including starting like I did as a classroom teacher. He has a deep understanding of the value of our work because he’s an AoPS parent! Meanwhile, Andrew and I have common roots as founders of education companies; he launched Quizlet at age 15! His journey from founder to MIT to technology and product leader as our Chief Product Officer traces a pathway many of our students will follow in the years to come.

Thank you again for your support for Art of Problem Solving and we look forward to working with millions more wonderful problem solvers in the years to come.

And special thanks to all of the amazing AoPS team members who have helped build AoPS. We’ve come a long way from here:IMAGE
1571 replies
rrusczyk
Mar 24, 2025
SmartGroot
Mar 26, 2025
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k a March Highlights and 2025 AoPS Online Class Information
jlacosta   0
Mar 2, 2025
March is the month for State MATHCOUNTS competitions! Kudos to everyone who participated in their local chapter competitions and best of luck to all going to State! Join us on March 11th for a Math Jam devoted to our favorite Chapter competition problems! Are you interested in training for MATHCOUNTS? Be sure to check out our AMC 8/MATHCOUNTS Basics and Advanced courses.

Are you ready to level up with Olympiad training? Registration is open with early bird pricing available for our WOOT programs: MathWOOT (Levels 1 and 2), CodeWOOT, PhysicsWOOT, and ChemWOOT. What is WOOT? WOOT stands for Worldwide Online Olympiad Training and is a 7-month high school math Olympiad preparation and testing program that brings together many of the best students from around the world to learn Olympiad problem solving skills. Classes begin in September!

Do you have plans this summer? There are so many options to fit your schedule and goals whether attending a summer camp or taking online classes, it can be a great break from the routine of the school year. Check out our summer courses at AoPS Online, or if you want a math or language arts class that doesn’t have homework, but is an enriching summer experience, our AoPS Virtual Campus summer camps may be just the ticket! We are expanding our locations for our AoPS Academies across the country with 15 locations so far and new campuses opening in Saratoga CA, Johns Creek GA, and the Upper West Side NY. Check out this page for summer camp information.

Be sure to mark your calendars for the following events:
[list][*]March 5th (Wednesday), 4:30pm PT/7:30pm ET, HCSSiM Math Jam 2025. Amber Verser, Assistant Director of the Hampshire College Summer Studies in Mathematics, will host an information session about HCSSiM, a summer program for high school students.
[*]March 6th (Thursday), 4:00pm PT/7:00pm ET, Free Webinar on Math Competitions from elementary through high school. Join us for an enlightening session that demystifies the world of math competitions and helps you make informed decisions about your contest journey.
[*]March 11th (Tuesday), 4:30pm PT/7:30pm ET, 2025 MATHCOUNTS Chapter Discussion MATH JAM. AoPS instructors will discuss some of their favorite problems from the MATHCOUNTS Chapter Competition. All are welcome!
[*]March 13th (Thursday), 4:00pm PT/7:00pm ET, Free Webinar about Summer Camps at the Virtual Campus. Transform your summer into an unforgettable learning adventure! From elementary through high school, we offer dynamic summer camps featuring topics in mathematics, language arts, and competition preparation - all designed to fit your schedule and ignite your passion for learning.[/list]
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0 replies
jlacosta
Mar 2, 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
J
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Colored Pencils for Math Competitions
Owinner   11
N 25 minutes ago by EaZ_Shadow
I've heard using colored pencils is really useful for geometry problems. Is this only for very hard problems, or can it be used in MATHCOUNTS/AMC 8/10? An example problem would be much appreciated.
11 replies
+1 w
Owinner
Yesterday at 5:56 PM
EaZ_Shadow
25 minutes ago
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AMC 10/AIME Study Forum
PatTheKing806   93
N 37 minutes ago by forestcaller2010
[center]

Me (PatTheKing806) and EaZ_Shadow have created a AMC 10/AIME Study Forum! Hopefully, this forum wont die quickly. To signup, do /join or \join.

Click here to join! (or do some pushups) :P

People should join this forum if they are wanting to do well on the AMC 10 next year, trying get into AIME, or loves math!
93 replies
PatTheKing806
Mar 27, 2025
forestcaller2010
37 minutes ago
J
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Easy geometry
Bluesoul   13
N 39 minutes ago by AshAuktober
Source: CJMO 2022 P1
Let $\triangle{ABC}$ has circumcircle $\Gamma$, drop the perpendicular line from $A$ to $BC$ and meet $\Gamma$ at point $D$, similarly, altitude from $B$ to $AC$ meets $\Gamma$ at $E$. Prove that if $AB=DE, \angle{ACB}=60^{\circ}$
(sorry it is from my memory I can't remember the exact problem, but it means the same)
13 replies
1 viewing
Bluesoul
Mar 12, 2022
AshAuktober
39 minutes ago
J
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Correlation between USAMO and CMO qualification
rantaccountcs   3
N an hour ago by BS2012
What is the correlation between cmo qualification and usamo qualification? What proportion of Canadian usamo qualifiers are cmo qualifiers and what proportion of cmo qualifiers are usamo qualifiers?
3 replies
rantaccountcs
Nov 2, 2023
BS2012
an hour ago
J
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IMO Shortlist 2013, Geometry #2
lyukhson   77
N an hour ago by endless_abyss
Source: IMO Shortlist 2013, Geometry #2
Let $\omega$ be the circumcircle of a triangle $ABC$. Denote by $M$ and $N$ the midpoints of the sides $AB$ and $AC$, respectively, and denote by $T$ the midpoint of the arc $BC$ of $\omega$ not containing $A$. The circumcircles of the triangles $AMT$ and $ANT$ intersect the perpendicular bisectors of $AC$ and $AB$ at points $X$ and $Y$, respectively; assume that $X$ and $Y$ lie inside the triangle $ABC$. The lines $MN$ and $XY$ intersect at $K$. Prove that $KA=KT$.
77 replies
lyukhson
Jul 9, 2014
endless_abyss
an hour ago
J
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f(x*f(y)) = f(x)/y
orl   23
N an hour ago by Maximilian113
Source: IMO 1990, Day 2, Problem 4, IMO ShortList 1990, Problem 25 (TUR 4)
Let $ {\mathbb Q}^ +$ be the set of positive rational numbers. Construct a function $ f : {\mathbb Q}^ + \rightarrow {\mathbb Q}^ +$ such that
\[ f(xf(y)) = \frac {f(x)}{y} \]
for all $ x$, $ y$ in $ {\mathbb Q}^ +$.
23 replies
orl
Nov 11, 2005
Maximilian113
an hour ago
J
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Heavy config geo involving mixtilinear
Assassino9931   2
N an hour ago by Assassino9931
Source: Bulgaria Spring Mathematical Competition 2025 12.4
Let $ABC$ be an acute-angled triangle \( ABC \) with \( AC > BC \) and incenter \( I \). Let \( \omega \) be the mixtilinear circle at vertex \( C \), i.e. the circle internally tangent to the circumcircle of \( \triangle ABC \) and also tangent to lines \( AC \) and \( BC \). A circle \( \Gamma \) passes through points \( A \) and \( B \) and is tangent to \( \omega \) at point \( T \), with \( C \notin \Gamma \) and \( I \) being inside \( \triangle ATB \). Prove that:
$$\angle CTB + \angle ATI = 180^\circ + \angle BAI - \angle ABI.$$
2 replies
Assassino9931
6 hours ago
Assassino9931
an hour ago
J
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Tennessee Math Tournament (TMT) Online 2025
TennesseeMathTournament   56
N an hour ago by Cerberusman
Hello everyone! We are excited to announce a new competition, the Tennessee Math Tournament, created by the Tennessee Math Coalition! Anyone can participate in the virtual competition for free.

The testing window is from March 22nd to April 12th, 2025. Virtual competitors may participate in the competition at any time during that window.

The virtual competition consists of three rounds: Individual, Bullet, and Team. The Individual Round is 60 minutes long and consists of 30 questions (AMC 10 level). The Bullet Round is 20 minutes long and consists of 80 questions (Mathcounts Chapter level). The Team Round is 30 minutes long and consists of 16 questions (AMC 12 level). Virtual competitors may compete in teams of four, or choose to not participate in the team round.

To register and see more information, click here!

If you have any questions, please email connect@tnmathcoalition.org or reply to this thread!

Thank you to our lead sponsor, Jane Street!

IMAGE
56 replies
TennesseeMathTournament
Mar 9, 2025
Cerberusman
an hour ago
J
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Guess the leader's binary string!
cjquines0   78
N an hour ago by de-Kirschbaum
Source: 2016 IMO Shortlist C1
The leader of an IMO team chooses positive integers $n$ and $k$ with $n > k$, and announces them to the deputy leader and a contestant. The leader then secretly tells the deputy leader an $n$-digit binary string, and the deputy leader writes down all $n$-digit binary strings which differ from the leader’s in exactly $k$ positions. (For example, if $n = 3$ and $k = 1$, and if the leader chooses $101$, the deputy leader would write down $001, 111$ and $100$.) The contestant is allowed to look at the strings written by the deputy leader and guess the leader’s string. What is the minimum number of guesses (in terms of $n$ and $k$) needed to guarantee the correct answer?
78 replies
cjquines0
Jul 19, 2017
de-Kirschbaum
an hour ago
J
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Monkeys have bananas
nAalniaOMliO   5
N an hour ago by jkim0656
Source: Belarusian National Olympiad 2025
Ten monkeys have 60 bananas. Each monkey has at least one banana and any two monkeys have different amounts of bananas.
Prove that any six monkeys can distribute their bananas between others such that all 4 remaining monkeys have the same amount of bananas.
5 replies
1 viewing
nAalniaOMliO
Friday at 8:20 PM
jkim0656
an hour ago
J
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Fixed point config on external similar isosceles triangles
Assassino9931   1
N an hour ago by E50
Source: Bulgaria Spring Mathematical Competition 2025 10.2
Let $AB$ be an acute scalene triangle. A point \( D \) varies on its side \( BC \). The points \( P \) and \( Q \) are the midpoints of the arcs \( \widehat{AB} \) and \( \widehat{AC} \) (not containing \( D \)) of the circumcircles of triangles \( ABD \) and \( ACD \), respectively. Prove that the circumcircle of triangle \( PQD \) passes through a fixed point, independent of the choice of \( D \) on \( BC \).
1 reply
Assassino9931
Today at 12:41 PM
E50
an hour ago
J
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Problem 2
Functional_equation   15
N an hour ago by basilis
Source: Azerbaijan third round 2020
$a,b,c$ are positive integer.
Solve the equation:
$ 2^{a!}+2^{b!}=c^3 $
15 replies
Functional_equation
Jun 6, 2020
basilis
an hour ago
J
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Intersection of a cevian with the incircle
djb86   24
N 2 hours ago by Ilikeminecraft
Source: South African MO 2005 Q4
The inscribed circle of triangle $ABC$ touches the sides $BC$, $CA$ and $AB$ at $D$, $E$ and $F$ respectively. Let $Q$ denote the other point of intersection of $AD$ and the inscribed circle. Prove that $EQ$ extended passes through the midpoint of $AF$ if and only if $AC = BC$.
24 replies
djb86
May 27, 2012
Ilikeminecraft
2 hours ago
J
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Polynomials and their shift with all real roots and in common
Assassino9931   2
N 2 hours ago by AshAuktober
Source: Bulgaria Spring Mathematical Competition 2025 11.4
We call two non-constant polynomials friendly if each of them has only real roots, and every root of one polynomial is also a root of the other. For two friendly polynomials \( P(x), Q(x) \) and a constant \( C \in \mathbb{R}, C \neq 0 \), it is given that \( P(x) + C \) and \( Q(x) + C \) are also friendly polynomials. Prove that \( P(x) \equiv Q(x) \).
2 replies
Assassino9931
6 hours ago
AshAuktober
2 hours ago
J
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J
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Pascal, Cayley and Fermat 2025
melpomene7   50
N Yesterday at 12:56 PM by Cerberusman
Anyone else do a CEMC contest? I did fermat but totally fumbled and got a 108.
50 replies
melpomene7
Feb 28, 2025
Cerberusman
Yesterday at 12:56 PM
J
Pascal, Cayley and Fermat 2025
G H J
Reveal topic tags
Fermat
Cayley
Pascal
CEMC
L
G H BBookmark kLocked kLocked NReply
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Mr.Sharkman
490 posts
Mr.Sharkman
#37 h  Mar 12, 2025, 9:52 PM
Y by
Pengu14 wrote:
Iwowowl253 wrote:
Is anyone doing the Fryer, Galois, Hypatia and Euclid contests?

What the sigma are these names

erm what the sigma; the brainrot is wild
This post has been edited 1 time. Last edited by Mr.Sharkman, Mar 12, 2025, 9:53 PM
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Cerberusman
319 posts
Cerberusman
#38 h  Mar 26, 2025, 11:17 PM
Y by
Mr.Sharkman wrote:
Pengu14 wrote:
Iwowowl253 wrote:
Is anyone doing the Fryer, Galois, Hypatia and Euclid contests?

What the sigma are these names

erm what the sigma; the brainrot is wild

Bro at least Canadians are creative! American contest names are just acronyms :noo:

on an unrelated note, I got 142/150 on pascal
Z K Y
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MathCosine
126 posts
MathCosine
#39 h  Mar 26, 2025, 11:33 PM
Y by
Cerberusman wrote:
Mr.Sharkman wrote:
Pengu14 wrote:
What the sigma are these names

erm what the sigma; the brainrot is wild

Bro at least Canadians are creative! American contest names are just acronyms :noo:

on an unrelated note, I got 142/150 on pascal

wait are the problems and solutions out?
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Cerberusman
319 posts
Cerberusman
#40 h  Mar 26, 2025, 11:55 PM
Y by
No, but I got the score
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MathCosine
126 posts
MathCosine
#41 h  Mar 27, 2025, 12:06 AM
Y by
Cerberusman wrote:
No, but I got the score

Wait where did you take it?(if you don’t mind me asking)
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jb2015007
1731 posts
jb2015007
#42 h  Mar 27, 2025, 12:42 AM
Y by
Disjunction wrote:
I did Pascal; I don't remember my answers, but I got 133/150 in the best case.

yoooo wsp disjunction
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Cerberusman
319 posts
Cerberusman
#43 h  Mar 27, 2025, 1:49 PM
Y by
MathCosine wrote:
Cerberusman wrote:
No, but I got the score

Wait where did you take it?(if you don’t mind me asking)

I took it at a local testing center in ontario (it doubles as a school, but I don't take classes there) called ICALC. They give preliminary results.
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melpomene7
4 posts
melpomene7
#44 h  Mar 27, 2025, 7:41 PM
Y by
Did any of yall get Fermat or Cayley results? Still haven’t got mine
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alexz103
17 posts
alexz103
#45 h  Mar 27, 2025, 8:21 PM • 2 Y
Y by Cerberusman, melpomene7
Got my Fermat results from my teacher.
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Majialin18
94 posts
Majialin18
#46 h  Friday at 8:46 PM
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I got 134 on the Fermat (grade 7 student).
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gooberIII
2 posts
gooberIII
#47 h  Friday at 8:52 PM
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dammmm crazy
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gooberIII
2 posts
gooberIII
#48 h  Friday at 8:52 PM
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I didn't make the honour roll but I'm pretty sure I got 132 for cayley
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llddmmtt1
393 posts
llddmmtt1
#49 h  Friday at 9:14 PM
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ez fermat sweep
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FuturePanda
233 posts
FuturePanda
#50 h  Yesterday at 3:03 AM
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I got my results from Pascal back(7th grade)

sweep
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Cerberusman
319 posts
Cerberusman
#51 h  Yesterday at 12:56 PM
Y by
FuturePanda wrote:
I got my results from Pascal back(7th grade)

sweep

BRO

CONGRATULATIONS
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