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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.

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[*]April 22nd (Webinar), 4:00pm PT/7:00pm ET, Competitive Programming at AoPS (USACO).[/list]
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0 replies
jlacosta
Apr 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
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Discuss the Stanford Math Tournament Here
Aaronjudgeisgoat   298
N 42 minutes ago by Munmun5
I believe discussion is allowed after yesterday at midnight, correct?
If so, I will put tentative answers on this thread.
By the way, does anyone know the answer to Geometry Problem 5? I was wondering if I got that one right
Also, if you put answers, please put it in a hide tag

Answers for the Algebra Subject Test
Estimated Algebra Cutoffs
Answers for the Geometry Subject Test
Estimated Geo Cutoffs
Answers for the Discrete Subject Test
Estimated Cutoffs for Discrete
Answers for the Team Round
Guts Answers
298 replies
Aaronjudgeisgoat
Apr 14, 2025
Munmun5
42 minutes ago
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RIP BS2012
gavinhaominwang   12
N an hour ago by KevinYang2.71
Rip BS2012, I hope you come back next year stronger and prove everyone wrong.
12 replies
gavinhaominwang
Today at 12:32 AM
KevinYang2.71
an hour ago
J
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Interesting inequalities
sqing   0
an hour ago
Source: Own
Let $ a,b,c\geq 0 ,b+c-ca=1 $ and $ c+a-ab=3.$ Prove that
$$a+\frac{19}{10}b-bc\leq 2-\sqrt 2$$$$a+\frac{17}{10}b+c-bc\leq 3$$$$ a^2+\frac{9}{5}b-bc\leq 6-4\sqrt 2$$$$ a^2+\frac{8}{5}b^2-bc\leq 6-4\sqrt 2$$$$a+1.974873b-bc\leq 2-\sqrt 2$$$$a+1.775917b+c-bc\leq 3$$

0 replies
sqing
an hour ago
0 replies
J
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Two permutations
Nima Ahmadi Pour   12
N 2 hours ago by Zhaom
Source: Iran prepration exam
Suppose that $ a_1$, $ a_2$, $ \ldots$, $ a_n$ are integers such that $ n\mid a_1 + a_2 + \ldots + a_n$.
Prove that there exist two permutations $ \left(b_1,b_2,\ldots,b_n\right)$ and $ \left(c_1,c_2,\ldots,c_n\right)$ of $ \left(1,2,\ldots,n\right)$ such that for each integer $ i$ with $ 1\leq i\leq n$, we have
\[ n\mid a_i - b_i - c_i \]

Proposed by Ricky Liu & Zuming Feng, USA
12 replies
Nima Ahmadi Pour
Apr 24, 2006
Zhaom
2 hours ago
J
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Easy Number Theory
math_comb01   37
N 2 hours ago by John_Mgr
Source: INMO 2024/3
Let $p$ be an odd prime and $a,b,c$ be integers so that the integers $$a^{2023}+b^{2023},\quad b^{2024}+c^{2024},\quad a^{2025}+c^{2025}$$are divisible by $p$.
Prove that $p$ divides each of $a,b,c$.
$\quad$
Proposed by Navilarekallu Tejaswi
37 replies
math_comb01
Jan 21, 2024
John_Mgr
2 hours ago
J
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ALGEBRA INEQUALITY
Tony_stark0094   3
N 2 hours ago by sqing
$a,b,c > 0$ Prove that $$\frac{a^2+bc}{b+c} + \frac{b^2+ac}{a+c} + \frac {c^2 + ab}{a+b} \geq a+b+c$$
3 replies
Tony_stark0094
Today at 12:17 AM
sqing
2 hours ago
J
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Inspired by hlminh
sqing   3
N 2 hours ago by sqing
Source: Own
Let $ a,b,c $ be real numbers such that $ a^2+b^2+c^2=1. $ Prove that $$ |a-kb|+|b-kc|+|c-ka|\leq \sqrt{3k^2+2k+3}$$Where $ k\geq 0 . $
3 replies
sqing
Yesterday at 4:43 AM
sqing
2 hours ago
J
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How many people get waitlisted st promys?
dragoon   26
N 2 hours ago by wuwang2002
Asking for a friend here
26 replies
dragoon
Apr 18, 2025
wuwang2002
2 hours ago
J
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A Familiar Point
v4913   51
N 2 hours ago by xeroxia
Source: EGMO 2023/6
Let $ABC$ be a triangle with circumcircle $\Omega$. Let $S_b$ and $S_c$ respectively denote the midpoints of the arcs $AC$ and $AB$ that do not contain the third vertex. Let $N_a$ denote the midpoint of arc $BAC$ (the arc $BC$ including $A$). Let $I$ be the incenter of $ABC$. Let $\omega_b$ be the circle that is tangent to $AB$ and internally tangent to $\Omega$ at $S_b$, and let $\omega_c$ be the circle that is tangent to $AC$ and internally tangent to $\Omega$ at $S_c$. Show that the line $IN_a$, and the lines through the intersections of $\omega_b$ and $\omega_c$, meet on $\Omega$.
51 replies
v4913
Apr 16, 2023
xeroxia
2 hours ago
J
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9 USA(J)MO Grading Poll
elasticwealth   6
N 2 hours ago by greenturtle3141
Please vote honestly. If you did not compete in the USA(J)MO, please do not vote.
6 replies
elasticwealth
4 hours ago
greenturtle3141
2 hours ago
J
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Apple sharing in Iran
mojyla222   3
N 3 hours ago by math-helli
Source: Iran 2025 second round p6
Ali is hosting a large party. Together with his $n-1$ friends, $n$ people are seated around a circular table in a fixed order. Ali places $n$ apples for serving directly in front of himself and wants to distribute them among everyone. Since Ali and his friends dislike eating alone and won't start unless everyone receives an apple at the same time, in each step, each person who has at least one apple passes one apple to the first person to their right who doesn't have an apple (in the clockwise direction).

Find all values of $n$ such that after some number of steps, the situation reaches a point where each person has exactly one apple.
3 replies
mojyla222
Apr 20, 2025
math-helli
3 hours ago
J
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Iran second round 2025-q1
mohsen   5
N 3 hours ago by math-helli
Find all positive integers n>2 such that sum of n and any of its prime divisors is a perfect square.
5 replies
mohsen
Apr 19, 2025
math-helli
3 hours ago
J
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Iran Team Selection Test 2016
MRF2017   9
N 3 hours ago by SimplisticFormulas
Source: TST3,day1,P2
Let $ABC$ be an arbitrary triangle and $O$ is the circumcenter of $\triangle {ABC}$.Points $X,Y$ lie on $AB,AC$,respectively such that the reflection of $BC$ WRT $XY$ is tangent to circumcircle of $\triangle {AXY}$.Prove that the circumcircle of triangle $AXY$ is tangent to circumcircle of triangle $BOC$.
9 replies
MRF2017
Jul 15, 2016
SimplisticFormulas
3 hours ago
J
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Combo problem
soryn   3
N 4 hours ago by soryn
The school A has m1 boys and m2 girls, and ,the school B has n1 boys and n2 girls. Each school is represented by one team formed by p students,boys and girls. If f(k) is the number of cases for which,the twice schools has,togheter k girls, fund f(k) and the valute of k, for which f(k) is maximum.
3 replies
soryn
Yesterday at 6:33 AM
soryn
4 hours ago
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USAMO Scores Release Date
CrunchyCucumber   14
N Apr 2, 2025 by CatCatHead
Does anyone know when individual scores, and medal+MOP cutoffs on the USAMO will be officially released? The website says 2-3 weeks, but I’ve heard it takes much longer in previous year.
14 replies
CrunchyCucumber
Apr 1, 2025
CatCatHead
Apr 2, 2025
J
USAMO Scores Release Date
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Reveal topic tags
AMC
USAMO
MOP
skibidi mop mop mop admits
hashbrown2009isorz
L
G H BBookmark kLocked kLocked NReply
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CrunchyCucumber
65 posts
CrunchyCucumber
#1 h  Apr 1, 2025, 6:22 PM
Y by
Does anyone know when individual scores, and medal+MOP cutoffs on the USAMO will be officially released? The website says 2-3 weeks, but I’ve heard it takes much longer in previous year.
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damathgoat
158 posts
damathgoat
#2 h  Apr 1, 2025, 9:49 PM
Y by
Nope sorry bro :(
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RaymondZhu
4005 posts
RaymondZhu
#3 h  Apr 1, 2025, 9:58 PM
Y by
some time between now and mop
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mathfan2010
3 posts
mathfan2010
#4 h  Apr 1, 2025, 10:15 PM
Y by
One dude said today that he got mopped. He received many congrats in the group and it did not sound April fools joke.
Z K Y
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bjump
1004 posts
bjump
#5 h  Apr 1, 2025, 10:32 PM
Y by
mathfan2010 wrote:
One dude said today that he got mopped. He received many congrats in the group and it did not sound April fools joke.

It was an admittedly bad April fools joke :oops:
Z K Y
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mathfan2010
3 posts
mathfan2010
#6 h  Apr 1, 2025, 10:47 PM
Y by
The guy is a top mathlete in the group and there was no sign of joking . Just wonder if anyone else also received USAMO/USAJMO results or news related MOP.

If the thread includes MOP in the topic, that may help attract more responses.
This post has been edited 4 times. Last edited by mathfan2010, Apr 2, 2025, 12:51 PM
Z K Y
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lu1376091
20 posts
lu1376091
#7 h  Apr 1, 2025, 11:28 PM
Y by
i was told that jmo cutoffs came out today
april foolsed by dotted calculator :blush:
Z K Y
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hashbrown2009
182 posts
hashbrown2009
#8 h  Apr 2, 2025, 12:00 AM
Y by
mathfan2010 wrote:
The guy is a top mathlete in the state and there was no sign of joking (he kept accepting congrats throughout the day without admitting it's a joke). Just wonder if anyone else also received USAMO/USAJMO results or news related MOP.

If the thread includes MOP in the topic, that may help attract more responses.

No MOP cutoffs came out today. It was likely a troll or a April Fool's Joke with everyone saying congrats to continue the joke. Again, No MOP cutoff results came today.

Also: r u an alt account because your AoPS acc only was created today and has only 2 posts
This post has been edited 2 times. Last edited by hashbrown2009, Apr 2, 2025, 12:48 AM
Reason: miswrite
Z K Y
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DottedCaculator
7339 posts
DottedCaculator
#9 h  Apr 2, 2025, 12:40 AM
Y by
lu1376091 wrote:
i was told that jmo cutoffs came out today
april foolsed by dotted calculator :blush:

jmo cutoffs came out a few weeks ago though
Z K Y
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mathfan2010
3 posts
mathfan2010
#10 h  Apr 2, 2025, 12:40 AM
Y by
Yes my account is new because I did not post in the past. Bro, USAJMO or USAMO cutoffs came out on March 4. Everybody knows that.
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hashbrown2009
182 posts
hashbrown2009
#11 h  Apr 2, 2025, 12:46 AM
Y by
mathfan2010 wrote:
Yes my account is new because I did not post in the past. Bro, USAJMO or USAMO cutoffs came out on March 4. Everybody knows that.

"I did not post in the past"
Your account was made April 1st, 2025. Is that not today?

edit: ik I miswrote USAJMO/USAMO cutoffs did not come out but I meant MOP. Sorry for the confusion.
This post has been edited 1 time. Last edited by hashbrown2009, Apr 2, 2025, 12:48 AM
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fake123
86 posts
fake123
#12 h  Apr 2, 2025, 12:50 AM
Y by
hashbrown2009 wrote:
mathfan2010 wrote:
Yes my account is new because I did not post in the past. Bro, USAJMO or USAMO cutoffs came out on March 4. Everybody knows that.

"I did not post in the past"
Your account was made April 1st, 2025. Is that not today?

edit: ik I miswrote USAJMO/USAMO cutoffs did not come out but I meant MOP. Sorry for the confusion.

no "april 1st, 2025" is not "today" idk what ur on about
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rhydon516
550 posts
rhydon516
#13 h  Apr 2, 2025, 12:52 AM • 1 Y
Y by elasticwealth
gaslighting = entertainment :popcorn:
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xHypotenuse
774 posts
xHypotenuse
#14 h  Apr 2, 2025, 3:21 AM
Y by
sometime between today and mop
Z K Y
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CatCatHead
32 posts
CatCatHead
#15 h  Apr 2, 2025, 9:54 AM
Y by
last year the medal list come on 4/25, and the mop email come some days earlier
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