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Contests & Programs AMC and other contests, summer programs, etc.
AMC and other contests, summer programs, etc.
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Contests & Programs AMC and other contests, summer programs, etc.
AMC and other contests, summer programs, etc.
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k a July Highlights and 2025 AoPS Online Class Information
jwelsh   0
Jul 1, 2025
We are halfway through summer, so be sure to carve out some time to keep your skills sharp and explore challenging topics at AoPS Online and our AoPS Academies (including the Virtual Campus)!

[list][*]Over 60 summer classes are starting at the Virtual Campus on July 7th - check out the math and language arts options for middle through high school levels.
[*]At AoPS Online, we have accelerated sections where you can complete a course in half the time by meeting twice/week instead of once/week, starting on July 8th:
[list][*]MATHCOUNTS/AMC 8 Basics
[*]MATHCOUNTS/AMC 8 Advanced
[*]AMC Problem Series[/list]
[*]Plus, AoPS Online has a special seminar July 14 - 17 that is outside the standard fare: Paradoxes and Infinity
[*]We are expanding our in-person AoPS Academy locations - are you looking for a strong community of problem solvers, exemplary instruction, and math and language arts options? Look to see if we have a location near you and enroll in summer camps or academic year classes today! New locations include campuses in California, Georgia, New York, Illinois, and Oregon and more coming soon![/list]

MOP (Math Olympiad Summer Program) just ended and the IMO (International Mathematical Olympiad) is right around the corner! This year’s IMO will be held in Australia, July 10th - 20th. Congratulations to all the MOP students for reaching this incredible level and best of luck to all selected to represent their countries at this year’s IMO! Did you know that, in the last 10 years, 59 USA International Math Olympiad team members have medaled and have taken over 360 AoPS Online courses. Take advantage of our Worldwide Online Olympiad Training (WOOT) courses
and train with the best! Please note that early bird pricing ends August 19th!
Are you tired of the heat and thinking about Fall? You can plan your Fall schedule now with classes at either AoPS Online, AoPS Academy Virtual Campus, or one of our AoPS Academies around the US.

Our full course list for upcoming classes is below:
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0 replies
jwelsh
Jul 1, 2025
0 replies
Preparing for AMC 10
woahtheicosahedronspins   6
N 16 minutes ago by Rice_Farmer
I'm a rising sophomore, and I will be taking the AMC 10 in November about 4.5 months from now. I hope to qualify for AIME. Last year I got a 60 on the AMC 10A with minimal prep. I am currently doing AOPS Vol 1 (on Ch. 13), and some practice problems (alcumus, past tests). Do you think that would be enough to qualify for AIME? What did you do to prepare for the AMC 10, and do you have any recommendations for me?
6 replies
+1 w
woahtheicosahedronspins
Jun 30, 2025
Rice_Farmer
16 minutes ago
how to cook amc 10
Soupboy0   12
N 18 minutes ago by Rice_Farmer
i can mock ~130-138 on amc 10s, but how do i mock 141+ for lighter jmo qual
12 replies
Soupboy0
6 hours ago
Rice_Farmer
18 minutes ago
[Registration Open!] 2025 Summer Solstice Math Olympiad
SMO_Team   38
N 31 minutes ago by aidan0626
[center]
IMAGE

Hello everyone!
[left]
We at Solstice Math Olympiads are extremely happy and excited to announce the SSMO, the Summer Solstice Math Olympiad. If you have any questions, please feel free to email us at solsticematholympiads@gmail.com.
[/left]

Signup here and join our discord!

How the Contest Will be Held
Test Information
Test Rules
Schedule
Prizes (~$10000!!!)
Additional Information

SPONSORS
A big thank you to our sponsors for making the 2025 SSMO possible!!!

Platinum Sponsors:

IMAGE



IMAGE


Gold Sponsors:

IMAGE


Silver Sponsors:

IMAGE

[/center]
38 replies
SMO_Team
Jun 4, 2025
aidan0626
31 minutes ago
bijection moment
DottedCaculator   50
N 3 hours ago by MathCosine
Source: 2022 AMC 10/12A #24
How many strings of length $5$ formed from the digits $0$,$1$,$2$,$3$,$4$ are there such that for each $j\in\{1,2,3,4\}$, at least $j$ of the digits are less than $j$? (For example, $02214$ satisfies the condition because it contains at least $1$ digit less than $1$, at least $2$ digits less than $2$, at least $3$ digits less than $3$, and at least $4$ digits less than $4$. The string $23404$ does not satisfy the condition because it does not contain at least $2$ digits less than $2$.)

$\textbf{(A) }500\qquad\textbf{(B) }625\qquad\textbf{(C) }1089\qquad\textbf{(D) }1199\qquad\textbf{(E) }1296$
50 replies
1 viewing
DottedCaculator
Nov 11, 2022
MathCosine
3 hours ago
Today's calculation of Integral 599
Kunihiko_Chikaya   5
N Yesterday at 3:55 PM by abdutlgz
Evaluate $\int_0^{\frac{\pi}{6}} \frac{e^x(\sin x+\cos x+\cos 3x)}{\cos^ 2 {2x}}\ dx$.

created by kunny
5 replies
Kunihiko_Chikaya
Apr 27, 2010
abdutlgz
Yesterday at 3:55 PM
A^2+B^2=AB+BA
mathisreal   1
N Yesterday at 10:50 AM by loup blanc
Source: OIMU 2023 #4
Determine all pairs of real matrices $(A,B)$ of size $2\times 2$ with $A\neq B$ such that
\[A^2+B^2=AB+BA=2I\]
1 reply
mathisreal
Yesterday at 12:03 AM
loup blanc
Yesterday at 10:50 AM
ISI UGB 2025 P3
SomeonecoolLovesMaths   14
N Yesterday at 10:10 AM by Cats_on_a_computer
Source: ISI UGB 2025 P3
Suppose $f : [0,1] \longrightarrow \mathbb{R}$ is differentiable with $f(0) = 0$. If $|f'(x) | \leq f(x)$ for all $x \in [0,1]$, then show that $f(x) = 0$ for all $x$.
14 replies
SomeonecoolLovesMaths
May 11, 2025
Cats_on_a_computer
Yesterday at 10:10 AM
ISI UGB 2025 P1
SomeonecoolLovesMaths   10
N Yesterday at 8:03 AM by Cats_on_a_computer
Source: ISI UGB 2025 P1
Suppose $f \colon \mathbb{R} \longrightarrow \mathbb{R}$ is differentiable and $| f'(x)| < \frac{1}{2}$ for all $x \in \mathbb{R}$. Show that for some $x_0 \in \mathbb{R}$, $f \left( x_0 \right) = x_0$.
10 replies
SomeonecoolLovesMaths
May 11, 2025
Cats_on_a_computer
Yesterday at 8:03 AM
2024 Putnam A1
KevinYang2.71   23
N Yesterday at 12:05 AM by megahertz13
Determine all positive integers $n$ for which there exists positive integers $a$, $b$, and $c$ satisfying
\[
2a^n+3b^n=4c^n.
\]
23 replies
KevinYang2.71
Dec 10, 2024
megahertz13
Yesterday at 12:05 AM
Matrices satisfy three conditions
ThE-dArK-lOrD   4
N Monday at 7:53 PM by Adustat
Source: IMC 2019 Day 1 P5
Determine whether there exist an odd positive integer $n$ and $n\times n$ matrices $A$ and $B$ with integer entries, that satisfy the following conditions:
[list=1]
[*]$\det (B)=1$;[/*]
[*]$AB=BA$;[/*]
[*]$A^4+4A^2B^2+16B^4=2019I$.[/*]
[/list]
(Here $I$ denotes the $n\times n$ identity matrix.)

Proposed by Orif Ibrogimov, ETH Zurich and National University of Uzbekistan
4 replies
ThE-dArK-lOrD
Jul 31, 2019
Adustat
Monday at 7:53 PM
Random points in the unit circle
math90   4
N Monday at 7:52 PM by Adustat
Source: IMC 2019 Day 2 P10
$2019$ points are chosen at random, independently, and distributed uniformly in the unit disc $\{(x,y)\in\mathbb R^2: x^2+y^2\le 1\}$. Let $C$ be the convex hull of the chosen points. Which probability is larger: that $C$ is a polygon with three vertices, or a polygon with four vertices?

Proposed by Fedor Petrov, St. Petersburg State University
4 replies
math90
Jul 31, 2019
Adustat
Monday at 7:52 PM
Spectrum of a function of permutations.
loup blanc   9
N Monday at 7:15 PM by loup blanc
Let $n$ be an even integer and $J_n$ be the $n\times n$ matrix of ones.
Let $S_n$ be the set of $n\times n$ permutation matrices, $f:P\in S_n\mapsto P^2+nP-J_n-I_n$
and $Z(P)=\{|\lambda|;\lambda\in spectrum(f(P))\}$.
Show that $\bigcap_{P\in S_n} Z(P)$ is constitued of 2 elements to be determined.
9 replies
loup blanc
Jun 7, 2025
loup blanc
Monday at 7:15 PM
Romania NMO 2023 Grade 11 P4
DanDumitrescu   6
N Monday at 6:58 PM by Filipjack
Source: Romania National Olympiad 2023
We consider a function $f:\mathbb{R} \rightarrow \mathbb{R}$ for which there exist a differentiable function $g : \mathbb{R} \rightarrow \mathbb{R}$ and exist a sequence $(a_n)_{n \geq 1}$ of real positive numbers, convergent to $0,$ such that

\[
    g'(x) = \lim_{n \to \infty} \frac{f(x + a_n) - f(x)}{a_n}, \forall x \in \mathbb{R}.
    \]
a) Give an example of such a function f that is not differentiable at any point $x \in \mathbb{R}.$

b) Show that if $f$ is continuous on $\mathbb{R}$, then $f$ is differentiable on $\mathbb{R}.$
6 replies
DanDumitrescu
Apr 14, 2023
Filipjack
Monday at 6:58 PM
The two-function hypothesis of the mean value theorem
fxandi   1
N Monday at 4:29 PM by fxandi
Given the constants $a$$,$ $b$$,$ $p$$,$ and $q$ with $p < a < b < q.$

Function $f : [a, b] \to \mathbb{R}$ satisfies the condition of the mean value theorem and function $g : [p, q] \to \mathbb{R}$ has the property $g(x) = f(x)$ on the interval $[a, b],$ but $g$ does not satisfy the condition of the mean value theorem on the interval $[p, q].$ Investigate whether there is a value of $c$ on the interval $(p, q)$ such that $g'(c) = \dfrac{g(q) - g(p)}{q - p}.$ Prove your answer$.$
1 reply
fxandi
Jul 6, 2025
fxandi
Monday at 4:29 PM
Coordbashing = 0?
UberPiggy   16
N May 21, 2025 by UberPiggy
Hi,

I just received my USAJMO score distribution: 000 701 (very cursed I know)

The thing is, I solved #5 (Geometry) by using Cartesian coordinates and tried to show a lot of detail in my calculations. I don't think I mislabeled the pages or anything either. I don't have the scans, but does anyone know why this might be the case? Thank you!
16 replies
UberPiggy
Apr 23, 2025
UberPiggy
May 21, 2025
Coordbashing = 0?
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UberPiggy
56 posts
#1
Y by
Hi,

I just received my USAJMO score distribution: 000 701 (very cursed I know)

The thing is, I solved #5 (Geometry) by using Cartesian coordinates and tried to show a lot of detail in my calculations. I don't think I mislabeled the pages or anything either. I don't have the scans, but does anyone know why this might be the case? Thank you!
Z K Y
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elasticwealth
346 posts
#2 • 3 Y
Y by Exponent11, aidan0626, OronSH
a 99% complete bash typically earns a zero
This post has been edited 1 time. Last edited by elasticwealth, Apr 23, 2025, 10:46 PM
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UberPiggy
56 posts
#3 • 1 Y
Y by Exponent11
Oh, that's unfortunate. I'll keep that in mind for next time, thank you!
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averageguy
42 posts
#4 • 1 Y
Y by Exponent11
I did the same thing and got a 0 for that as well. Maybe doing a cordbash just gets you a 0?
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MajesticCheese
26 posts
#5 • 3 Y
Y by Exponent11, jcoons91, Pengu14
I coordbashed and got a 7 uhhh

maybe something went wrong?
This post has been edited 1 time. Last edited by MajesticCheese, Apr 23, 2025, 10:53 PM
Z K Y
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elasticwealth
346 posts
#6 • 3 Y
Y by Exponent11, jcoons91, aidan0626
a coordbash that 100% works gets a 7
any small issues = zero (I've heard)
This post has been edited 1 time. Last edited by elasticwealth, Apr 23, 2025, 11:01 PM
Reason: typo
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llddmmtt1
431 posts
#7 • 3 Y
Y by jcoons91, aidan0626, KevinChen_Yay
bash is either 0 or 7, no in between unless you make a nontrivial synthetic observation
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EZ588
41 posts
#8
Y by
my incomplete barybash got a 1
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KevinChen_Yay
244 posts
#9
Y by
@above
llddmmtt1 wrote:
nontrivial synthetic observation

probably right?
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DottedCaculator
7414 posts
#10
Y by
llddmmtt1 wrote:
bash is either 0 or 7, no in between unless you make a nontrivial synthetic observation

I heard someone got a 3 on a problem once.
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EZ588
41 posts
#11
Y by
KevinChen_Yay wrote:
@above
llddmmtt1 wrote:
nontrivial synthetic observation

probably right?

maybe identifying the cyclic quadrilateral gives one point?
Z K Y
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UberPiggy
56 posts
#12
Y by
Sorry for the bump. I know this is a relatively old thread but could anyone tell me what errors I made in my solution (attached)?
Maybe I should have used darker ink for the diagram
Attachments:
JMO_P5.pdf (395kb)
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LearnMath_105
158 posts
#13
Y by
I've heard multiple people (including me) got a 6 from coord bash on this
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freefall222
5 posts
#14
Y by
UberPiggy wrote:
Hi,

I just received my USAJMO score distribution: 000 701 (very cursed I know)

The thing is, I solved #5 (Geometry) by using Cartesian coordinates and tried to show a lot of detail in my calculations. I don't think I mislabeled the pages or anything either. I don't have the scans, but does anyone know why this might be the case? Thank you!

The distrib is hurting my eyes
Z K Y
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Math4Life2020
2966 posts
#15
Y by
elasticwealth wrote:
a 99% complete bash typically earns a zero

i've gotten a 6 on TSTST and a 6 on RMM with slighly incorrect bashes
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aidensharp
363 posts
#16 • 1 Y
Y by Pengu14
UberPiggy wrote:
Sorry for the bump. I know this is a relatively old thread but could anyone tell me what errors I made in my solution (attached)?
Maybe I should have used darker ink for the diagram

I kinda suck at math but on page 4, if OC has slope $\frac{a-1}{b}$ and BC has slope $\frac{b}{a-1}$, that doesn't imply they are perpendicular. It would have to be BC has slope $\frac{b}{1-a}$?
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UberPiggy
56 posts
#17
Y by
I just saw that, thanks for the catch. I don't think I made this error anywhere else though, is this a big enough mistake to justify a 0?
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