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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
MATHCOUNTS 2011 Target P8
mithu542   5
N 3 hours ago by John_Mgr
$      $
5 replies
mithu542
Mar 5, 2025
John_Mgr
3 hours ago
A twist on a classic
happypi31415   7
N 3 hours ago by invisibleman
Rank from smallest to largest: $\sqrt[2]{2}$, $\sqrt[3]{3}$, and $\sqrt[5]{5}$.

Click to reveal hidden text
7 replies
happypi31415
Yesterday at 3:01 PM
invisibleman
3 hours ago
9 Pi or Tau
jkim0656   103
N 5 hours ago by jkim0656
Hey Aops!
Pi = Circumfrence/Diameter
Tau = Circumfrence/Radius
I have noticed a lot of sites, including Khan Academy, in support of tau over pi...
so what do you think?
https://www.scientificamerican.com/article/let-s-use-tau-it-s-easier-than-pi/
However i am still in support of the good ol pi :)
(btw this is my first aops poll) :-D

EDIT: 50 votes!!! :play_ball:
EDIT: 100 votes!!! :jump:
EDIT: 150 votes! :trampoline:
EDIT: 200 votes! ;)
Edit: 250 votes !!!! yaya :gathering:

If u support pi pls upvote :)
103 replies
jkim0656
Mar 14, 2025
jkim0656
5 hours ago
Mathcounts state help
mathelvin   4
N 6 hours ago by LS5679
There’s only like 10 days until the competition and I’m still getting 14s and 15s on mock sprints. What should I do guys. Also I have max 5 hours of study time per a day
4 replies
mathelvin
Today at 2:23 AM
LS5679
6 hours ago
Differentiation Marathon!
LawofCosine   185
N Today at 12:24 AM by LawofCosine
Hello, everybody!

This is a differentiation marathon. It is just like an ordinary marathon, where you can post problems and provide solutions to the problem posted by the previous user. You can only post differentiation problems (not including integration and differential equations) and please don't make it too hard!

Have fun!

(Sorry about the bad english)
185 replies
LawofCosine
Feb 1, 2025
LawofCosine
Today at 12:24 AM
Integration Bee Kaizo
Calcul8er   46
N Today at 12:18 AM by awzhang10
Hey integration fans. I decided to collate some of my favourite and most evil integrals I've written into one big integration bee problem set. I've been entering integration bees since 2017 and I've been really getting hands on with the writing side of things over the last couple of years. I hope you'll enjoy!
46 replies
Calcul8er
Mar 2, 2025
awzhang10
Today at 12:18 AM
Geometric Optimization Problem
ReticulatedPython   0
Yesterday at 6:59 PM
Source: Myself
Consider three concentric circles with radii of lengths $a$, $b$, and $c$, with $a<b<c.$ Point $A$ is chosen on the circle with radius $a$, point $B$ is chosen on the circle with radius $b$, and point $C$ is chosen on the circle with radius $c.$ Find (in terms of $a$, $b$, and $c$):

(a) The maximum possible area of $\triangle{ABC}.$
(b)The maximum possible perimeter of $\triangle{ABC}.$
0 replies
ReticulatedPython
Yesterday at 6:59 PM
0 replies
f must be a constant function
WakeUp   2
N Yesterday at 3:31 PM by Fibonacci_math
Let $f:\mathbb{R}\rightarrow\mathbb{R}$ be a continuous and bounded function such that
\[x\int_{x}^{x+1}f(t)\, \text{d}t=\int_{0}^{x}f(t)\, \text{d}t,\quad\text{for any}\ x\in\mathbb{R}.\]
Prove that $f$ is a constant function.
2 replies
WakeUp
Dec 8, 2010
Fibonacci_math
Yesterday at 3:31 PM
real analysis
ay19bme   1
N Yesterday at 3:21 PM by Etkan
Show that $f(x)=\left(1-\dfrac{1}{x}\right)^x$ is increasing for all $x\in[1,\infty)$.
1 reply
ay19bme
Yesterday at 2:31 PM
Etkan
Yesterday at 3:21 PM
probability prime numbers
danilorj   0
Yesterday at 1:28 PM
What is the probability of the sum of the numbers showing up on the top of 100 six-sided dice being a prime number when they are thrown simultaneously?
0 replies
danilorj
Yesterday at 1:28 PM
0 replies
Concavity of a function
pii-oner   2
N Yesterday at 10:12 AM by pii-oner
Hi everyone,

I am studying the concavity of the function

\[
f(x) = \sqrt{1 - x^a}, \quad a \geq 0
\]
on the interval \( x \in [0,1] \).

I computed the second derivative and found that for \( a \geq 1 \), the function appears to be concave. However, I am uncertain about the behavior at the endpoints.

Does anyone have insights on confirming concavity rigorously for \( a \geq 1 \) and understanding the behavior at the endpoints? Any help would be greatly appreciated!

Thanks!
2 replies
pii-oner
Mar 16, 2025
pii-oner
Yesterday at 10:12 AM
Do these have a closed form?
Entrepreneur   0
Yesterday at 8:18 AM
Source: Own
$$\int_0^\infty\frac{t^{n-1}}{(t+\alpha)^2+m^2}dt.$$$$\int_0^\infty\frac{e^{nt}}{(t+\alpha)^2+m^2}dt.$$$$\int_0^\infty\frac{dx}{(1+x^a)^m(1+x^b)^n}.$$
0 replies
Entrepreneur
Yesterday at 8:18 AM
0 replies
Interesting limit with bijective function
AndreiVila   3
N Yesterday at 3:46 AM by Levieee
Source: Romanian District Olympiad 2025 11.3
Let $f:[0,\infty)\rightarrow [0,\infty)$ be a continuous and bijective function, such that $$\lim_{x\rightarrow\infty}\frac{f^{-1}(f(x)/x)}{x}=1.$$[list=a]
[*] Show that $\lim_{x\rightarrow\infty}\frac{f(x)}{x}=\infty$ and $\lim_{x\rightarrow\infty}\frac{f^{-1}(ax)}{f^{-1}(x)}=1$ for any $a>0$.
[*] Give an example of function which satisfies the hypothesis.
3 replies
AndreiVila
Mar 8, 2025
Levieee
Yesterday at 3:46 AM
Double factorial identity
Snoop76   0
Sunday at 6:31 PM
Source: own
Show that the following identity holds:$$\sum_{k=0}^n (2k+3)!!{n\choose k}=2(n+1)\sum_{k=0}^n (2k+1)!!{n\choose k}+\sum_{k=0}^n (2k-1)!!{n\choose k}$$
0 replies
Snoop76
Sunday at 6:31 PM
0 replies
What was your Mathcounts Chant?
ilovebender   59
N Yesterday at 9:32 PM by wikjay
Hi, I wanted to ask everyone, before the written competition, each state had to do their chant. What chant did you and your team make xd!

Im in WV and I think we did the least cringe chant, and it goes like this:

(After one person says something, the other person following waits ~2 seconds, and then says their line)
P1: Hi
P2: Hi
P3: Hi
P4: Bye

Lol if you were at the national competition you prob remember.
59 replies
ilovebender
May 12, 2022
wikjay
Yesterday at 9:32 PM
What was your Mathcounts Chant?
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heheman
999 posts
#47
Y by
akpi2 wrote:
peelybonehead wrote:
If I made nats, this would’ve been my chant:

I HOPE YOU GUYS FAIL ALL THE PROBLEMS! (clap) (clap) (clap) repeat

That would definitely not make some people happy!
:rotfl:

that would make me feel better because i wouldnt be alone
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heheman
999 posts
#48
Y by
i was the only 0 scorer on mathcounts nationalsClick to reveal hidden text
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Cygnet
2689 posts
#49
Y by
heheman wrote:
i was the only 0 scorer on mathcounts nationalsClick to reveal hidden text

Me, too! I was the second 0 scorer. :D
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Aaronjudgeisgoat
823 posts
#50
Y by
ilovebender wrote:
Hi, I wanted to ask everyone, before the written competition, each state had to do their chant. What chant did you and your team make xd!

Im in WV and I think we did the least cringe chant, and it goes like this:

(After one person says something, the other person following waits ~2 seconds, and then says their line)
P1: Hi
P2: Hi
P3: Hi
P4: Bye

Lol if you were at the national competition you prob remember.

sj what should be our chant now
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MathRook7817
603 posts
#51
Y by
2023 Alabama Chant:

Us: We say Ala-, you say -Bama!
Us: Ala-
Them: -Bama
Us: Ala-
Them: -Bama
Us: We say Math-, you say -Counts!
Us: Math-
Them: -Counts
Us: Math-
Them: -Counts

Us: WE HAVE ALAN SHENG!!!!!!
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Mithum_math
3 posts
#52 • 1 Y
Y by master_Eric_chill
Ohio on u lost hahahaahahahahahahahahahahah
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master_Eric_chill
5 posts
#53 • 2 Y
Y by PikaPika999, Mithum_math
ohio ohio were so skibbidi
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vincentwant
1231 posts
#54 • 1 Y
Y by PikaPika999
happy national taxes/texas day we're taxing rhode island
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anticodon
112 posts
#55
Y by
We said something really boring along the lines of "good luck everyone happy mathing" because the coach wanted positivity
well he also wanted us to yell but all of us are introverts so that didn't work
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Arcticturn
201 posts
#56
Y by
We are farmers bum buda buda bum buda bum (Kansas)

edit: this was both the 2022 and 2024 chant
This post has been edited 1 time. Last edited by Arcticturn, Mar 14, 2025, 1:19 AM
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Inaaya
190 posts
#57
Y by
mahaler wrote:
Go michigan! The mitten state!

Points to our home towns on our handy dandy hand map

yayyyyyy
MI ftw!
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aoh11
200 posts
#58 • 1 Y
Y by PikaPika999
YaoAOPS wrote:
Quentissential wrote:
Team AZ didn't have one since my teammates are lazy

Yes we are

are you puranjay madupu because he is so good at math
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anticodon
112 posts
#59 • 1 Y
Y by PikaPika999
This years Oregon chant, tentative:
"Pentagon, hexagon, Ore-gon"

it's interesting... and made by two 6th graders
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ethan2011
219 posts
#60 • 1 Y
Y by PikaPika999
rg_ryse wrote:
new jersey's chant was better than anything i could come up with tbh
evan and dotted op :D

what was it
2024 NJ was "We are the champions"
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wikjay
230 posts
#61
Y by
aoh11 wrote:
YaoAOPS wrote:
Quentissential wrote:
Team AZ didn't have one since my teammates are lazy

Yes we are

are you puranjay madupu because he is so good at math

buh
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