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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.

WOOT early bird pricing is in effect, don’t miss out! If you took MathWOOT Level 2 last year, no worries, it is all new problems this year! Our Worldwide Online Olympiad Training program is for high school level competitors. AoPS designed these courses to help our top students get the deep focus they need to succeed in their specific competition goals. Check out the details at this link for all our WOOT programs in math, computer science, chemistry, and physics.

Looking for summer camps in math and language arts? Be sure to check out the video-based summer camps offered at the Virtual Campus that are 2- to 4-weeks in duration. 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 events:
[list][*]April 3rd (Webinar), 4pm PT/7:00pm ET, Learning with AoPS: Perspectives from a Parent, Math Camp Instructor, and University Professor
[*]April 8th (Math Jam), 4:30pm PT/7:30pm ET, 2025 MATHCOUNTS State Discussion
April 9th (Webinar), 4:00pm PT/7:00pm ET, Learn about Video-based Summer Camps at the Virtual Campus
[*]April 10th (Math Jam), 4:30pm PT/7:30pm ET, 2025 MathILy and MathILy-Er Math Jam: Multibackwards Numbers
[*]April 22nd (Webinar), 4:00pm PT/7:00pm ET, Competitive Programming at AoPS (USACO).[/list]
Our full course list for upcoming classes is below:
All classes run 7:30pm-8:45pm ET/4:30pm - 5:45pm PT unless otherwise noted.

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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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9 Did I make the right choice?
Martin2001   19
N 33 minutes ago by hashbrown2009
If you were in 8th grade, would you rather go to MOP or mc nats? I chose to study the former more and got in so was wondering if that was valid given that I'll never make mc nats.
19 replies
Martin2001
Yesterday at 1:42 PM
hashbrown2009
33 minutes ago
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Hard inequality
JK1603JK   3
N 38 minutes ago by GeoMorocco
Source: unknown?
Let $a,b,c>0$ and $a^2+b^2+c^2=2(a+b+c).$ Find the minimum $$P=(a+b+c)\left(\frac{1}{a}+\frac{1}{b}+\frac{1}{c}\right)$$
3 replies
JK1603JK
Yesterday at 4:24 AM
GeoMorocco
38 minutes ago
J
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Geometry with orthocenter config
thdnder   3
N an hour ago by moony_
Source: Own
Let $ABC$ be a triangle, and let $AD, BE, CF$ be its altitudes. Let $H$ be its orthocenter, and let $O_B$ and $O_C$ be the circumcenters of triangles $AHC$ and $AHB$. Let $G$ be the second intersection of the circumcircles of triangles $FDO_B$ and $EDO_C$. Prove that the lines $DG$, $EF$, and $A$-median of $\triangle ABC$ are concurrent.
3 replies
+1 w
thdnder
Yesterday at 5:26 PM
moony_
an hour ago
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7^a - 3^b divides a^4 + b^2 (from IMO Shortlist 2007)
Dida Drogbier   38
N an hour ago by sansgankrsngupta
Source: ISL 2007, N1, VAIMO 2008, P4
Find all pairs of natural numbers $ (a, b)$ such that $ 7^a - 3^b$ divides $ a^4 + b^2$.

Author: Stephan Wagner, Austria
38 replies
1 viewing
Dida Drogbier
Apr 21, 2008
sansgankrsngupta
an hour ago
J
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Choose P on (AOB) and Q on (AOC)
MarkBcc168   8
N an hour ago by NO_SQUARES
Source: ELMO Shortlist 2024 G5
Let $ABC$ be a triangle with circumcenter $O$ and circumcircle $\omega$. Let $D$ be the foot of the altitude from $A$ to $\overline{BC}$. Let $P$ and $Q$ be points on the circumcircles of triangles $AOB$ and $AOC$, respectively, such that $A$, $P$, and $Q$ are collinear. Prove that if the circumcircle of triangle $OPQ$ is tangent to $\omega$ at $T$, then $\angle BTD=\angle CAP$.

Tiger Zhang
8 replies
MarkBcc168
Jun 22, 2024
NO_SQUARES
an hour ago
J
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easy functional
B1t   13
N an hour ago by AshAuktober
Source: Mongolian TST 2025 P1.
Denote the set of real numbers by $\mathbb{R}$. Find all functions $f: \mathbb{R} \to \mathbb{R}$ such that for all $x, y, z \in \mathbb{R}$,
\[ f(xf(x+y)+z) = f(z) + f(x)y + f(xf(x)). \]
13 replies
B1t
Apr 26, 2025
AshAuktober
an hour ago
J
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problem interesting
Cobedangiu   3
N an hour ago by tom-nowy
Let $a=3k^2+3k+1 (a,k \in N)$
$i)$ Prove that: $a^2$ is the sum of $3$ square numbers
$ii)$ Let $b \vdots a$ and $b$ is the sum of $3$ square numbers. Prove that: $b^n$ is the sum of $3$ square numbers
3 replies
Cobedangiu
Today at 5:06 AM
tom-nowy
an hour ago
J
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Do not try to bash on beautiful geometry
ItzsleepyXD   2
N an hour ago by moony_
Source: Own , Mock Thailand Mathematic Olympiad P9
Let $ABC$be triangle with point $D,E$ and $F$ on $BC,AB,CA$
such that $BE=CF$ and $E,F$ are on the same side of $BC$
Let $M$ be midpoint of segment $BC$ and $N$ be midpoint of segment $EF$
Let $G$ be intersection of $BF$ with $CE$ and $\dfrac{BD}{DC}=\dfrac{AC}{AB}$
Prove that $MN\parallel DG$
2 replies
ItzsleepyXD
4 hours ago
moony_
an hour ago
J
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Trivial fun Equilateral
ItzsleepyXD   3
N 2 hours ago by Tsikaloudakis
Source: Own , Mock Thailand Mathematic Olympiad P1
Let $ABC$ be a scalene triangle with point $P$ and $Q$ on the plane such that $\triangle BPC , \triangle CQB$ is an equilateral . Let $AB$ intersect $CP$ and $CQ$ at $X$ and $Z$ respectively and $AC$ intersect $BP$ and $BQ$ at $Y$ and $W$ respectively .
Prove that $XY\parallel ZW$
3 replies
ItzsleepyXD
5 hours ago
Tsikaloudakis
2 hours ago
J
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Question on Balkan SL
Fmimch   3
N 2 hours ago by GreekIdiot
Does anyone know where to find the Balkan MO Shortlist 2024? If you have the file, could you send in this thread? Thank you!
3 replies
Fmimch
Today at 12:13 AM
GreekIdiot
2 hours ago
J
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Something about (BIC)
flower417477   2
N 2 hours ago by sami1618
Given $\triangle ABC$ with incenter $I$,$D$ is a point on $BC$ ,the bisector of $\angle ADB$ meet $(BIC)$ at $E,F$.Prove that $\angle EAD=\angle IAF$
2 replies
flower417477
Monday at 3:58 PM
sami1618
2 hours ago
J
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the circle problem
miquelmas   0
4 hours ago
Source: Olympiad of the city of Almaty (selection for the IZhO) 2010
The circle ω is centered at the quadrilateral ABCD. The lines AB and CD meet at point K, and the lines AD and BC meet at point L. A line passing through the center of ω and perpendicular to KL intersects KL, CD and AD at P, Q and R respectively. We need to prove that the lines QL, BP and KR all intersect at the same point.
0 replies
miquelmas
4 hours ago
0 replies
J
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How many approaches you got? (A lot)
IAmTheHazard   84
N 6 hours ago by User141208
Source: USAMO 2023/2
Let $\mathbb{R}^+$ be the set of positive real numbers. Find all functions $f \colon \mathbb{R}^+ \to \mathbb{R}^+$ such that, for all $x,y \in \mathbb{R}^+$,
$$f(xy+f(x))=xf(y)+2.$$
84 replies
IAmTheHazard
Mar 23, 2023
User141208
6 hours ago
J
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MasterScholar North Carolina Math Camp
Ruegerbyrd   5
N Today at 7:07 AM by ohiorizzler1434
Is this legit? Worth the cost ($6500)? Program Fees Cover: Tuition, course materials, field trip costs, and housing and meals at Saint Mary's School.

"Themes:

1. From Number Theory and Special Relativity to Game Theory
2. Applications to Economics

Subjects Covered:

Number Theory - Group Theory - RSA Encryption - Game Theory - Estimating Pi - Complex Numbers - Quaternions - Topology of Surfaces - Introduction to Differential Geometry - Collective Decision Making - Survey of Calculus - Applications to Economics - Statistics and the Central Limit Theorem - Special Relativity"

website(?): https://www.teenlife.com/l/summer/masterscholar-north-carolina-math-camp/
5 replies
Ruegerbyrd
Today at 3:15 AM
ohiorizzler1434
Today at 7:07 AM
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J
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2025 Math and AI 4 Girls Competition: Win Up To $1,000!!!
audio-on   63
N Yesterday at 12:56 AM by RainbowSquirrel53B
Join the 2025 Math and AI 4 Girls Competition for a chance to win up to $1,000!

Hey Everyone, I'm pleased to announce the dates for the 2025 MA4G Competition are set!
Applications will open on March 22nd, 2025, and they will close on April 26th, 2025 (@ 11:59pm PST).

Applicants will have one month to fill out an application with prizes for the top 50 contestants & cash prizes for the top 20 contestants (including $1,000 for the winner!). More details below!

Eligibility:
The competition is free to enter, and open to middle school female students living in the US (5th-8th grade).
Award recipients are selected based on their aptitude, activities and aspirations in STEM.

Event dates:
Applications will open on March 22nd, 2025, and they will close on April 26th, 2025 (by 11:59pm PST)
Winners will be announced on June 28, 2025 during an online award ceremony.

Application requirements:
Complete a 12 question problem set on math and computer science/AI related topics
Write 2 short essays

Prizes:
1st place: $1,000 Cash prize
2nd place: $500 Cash prize
3rd place: $300 Cash prize
4th-10th: $100 Cash prize each
11th-20th: $50 Cash prize each
Top 50 contestants: Over $50 worth of gadgets and stationary

Many thanks to our current and past sponsors and partners: Hudson River Trading, MATHCOUNTS, Hewlett Packard Enterprise, Automation Anywhere, JP Morgan Chase, D.E. Shaw, and AI4ALL.

Math and AI 4 Girls is a nonprofit organization aiming to encourage young girls to develop an interest in math and AI by taking part in STEM competitions and activities at an early age. The organization will be hosting an inaugural Math and AI 4 Girls competition to identify talent and encourage long-term planning of academic and career goals in STEM.

Contact:
mathandAI4girls@yahoo.com

For more information on the competition:
https://www.mathandai4girls.org/math-and-ai-4-girls-competition

More information on how to register will be posted on the website. If you have any questions, please ask here!


63 replies
audio-on
Jan 26, 2025
RainbowSquirrel53B
Yesterday at 12:56 AM
J
2025 Math and AI 4 Girls Competition: Win Up To $1,000!!!
G H J
Reveal topic tags
Math Competitions
middle school math contests
Middle School contests
AI
computer science
middle school math
Girls
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audio-on
513 posts
audio-on
#1 h  Jan 26, 2025, 1:34 AM • 17 Y
Y by stuffedmath, christinaa.luu, manaleec, EveningDawn, KnowingAnt, crazyeyemoody907, elasticwealth, clarkculus, cubres, PikaPika999, megarnie, Cinnamon.-.Roll, beishexi, fossasor, Exponent11, mathfan2020, Penguin117
Join the 2025 Math and AI 4 Girls Competition for a chance to win up to $1,000!

Hey Everyone, I'm pleased to announce the dates for the 2025 MA4G Competition are set!
Applications will open on March 22nd, 2025, and they will close on April 26th, 2025 (@ 11:59pm PST).

Applicants will have one month to fill out an application with prizes for the top 50 contestants & cash prizes for the top 20 contestants (including $1,000 for the winner!). More details below!

Eligibility:
The competition is free to enter, and open to middle school female students living in the US (5th-8th grade).
Award recipients are selected based on their aptitude, activities and aspirations in STEM.

Event dates:
Applications will open on March 22nd, 2025, and they will close on April 26th, 2025 (by 11:59pm PST)
Winners will be announced on June 28, 2025 during an online award ceremony.

Application requirements:
Complete a 12 question problem set on math and computer science/AI related topics
Write 2 short essays

Prizes:
1st place: $1,000 Cash prize
2nd place: $500 Cash prize
3rd place: $300 Cash prize
4th-10th: $100 Cash prize each
11th-20th: $50 Cash prize each
Top 50 contestants: Over $50 worth of gadgets and stationary

Many thanks to our current and past sponsors and partners: Hudson River Trading, MATHCOUNTS, Hewlett Packard Enterprise, Automation Anywhere, JP Morgan Chase, D.E. Shaw, and AI4ALL.

Math and AI 4 Girls is a nonprofit organization aiming to encourage young girls to develop an interest in math and AI by taking part in STEM competitions and activities at an early age. The organization will be hosting an inaugural Math and AI 4 Girls competition to identify talent and encourage long-term planning of academic and career goals in STEM.

Contact:
mathandAI4girls@yahoo.com

For more information on the competition:
https://www.mathandai4girls.org/math-and-ai-4-girls-competition

More information on how to register will be posted on the website. If you have any questions, please ask here!
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Ruegerbyrd
1075 posts
Ruegerbyrd
#6 h  Jan 26, 2025, 11:25 PM • 3 Y
Y by ChampionGirl, cubres, PikaPika999
why only middle school :(
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christinaa.luu
5 posts
christinaa.luu
#7 h  Jan 27, 2025, 1:50 AM • 2 Y
Y by cubres, PikaPika999
Will the online award ceremony be recorded if I can’t attend live?
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audio-on
513 posts
audio-on
#8 h  Feb 1, 2025, 1:53 AM • 2 Y
Y by cubres, PikaPika999
christinaa.luu wrote:
Will the online award ceremony be recorded if I can’t attend live?

Yes, we will record the online award ceremony :)
You can access recordings from previous years on our YouTube channel or on our website under the result from each year (for example, the slide presentation and recording link for 2024 are under "Additional Links")
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SanrioSmarties05
159 posts
SanrioSmarties05
#9 h  Feb 1, 2025, 1:59 AM • 2 Y
Y by cubres, PikaPika999
How exactly will this work?
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mirzakhani12
4 posts
mirzakhani12
#10 h  Feb 8, 2025, 7:22 PM • 3 Y
Y by cubres, abhavsar, PikaPika999
This sounds like a great initiative! What steps can students take to prepare?
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audio-on
513 posts
audio-on
#12 h  Feb 10, 2025, 7:29 PM • 2 Y
Y by cubres, PikaPika999
SanrioSmarties05 wrote:
How exactly will this work?

After applications open on 3/22, you'll have about a month to complete the application!
We will post a Submittable link closer to the competition on our website, and you can find the problem set + essay questions there.
Applications will be filled out on Submittable.
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audio-on
513 posts
audio-on
#13 h  Feb 10, 2025, 7:32 PM • 2 Y
Y by cubres, PikaPika999
mirzakhani12 wrote:
This sounds like a great initiative! What steps can students take to prepare?

Students will be tested on a variety of topics. The problem set is mainly math, although having a bit of computer science knowledge could help.
I would recommend looking at the past competitions under our past contests tab here where you can find the problem set + solutions for 2021 - 2023. You can find the problems and solutions from last year's competition here.

Hope this helps!
This post has been edited 1 time. Last edited by audio-on, Feb 10, 2025, 7:33 PM
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christinaa.luu
5 posts
christinaa.luu
#14 h  Mar 9, 2025, 12:25 AM • 2 Y
Y by cubres, PikaPika999
Do I need a lot of experience in AI and programming to be able to participate?
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angie.
318 posts
angie.
#15 h  Mar 17, 2025, 3:04 AM • 2 Y
Y by cubres, PikaPika999
christinaa.luu wrote:
Do I need a lot of experience in AI and programming to be able to participate?

No, you don't need any experience in AI or programming to participate! Most of the contest is logic based, and the CS involves simple pseudocode designed to be accessible for everyone.
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RainbowSquirrel53B
590 posts
RainbowSquirrel53B
#16 h  Mar 17, 2025, 3:02 PM • 2 Y
Y by cubres, PikaPika999
How many contestants are there usually?
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ev2028
2 posts
ev2028
#17 h  Mar 22, 2025, 11:33 PM • 2 Y
Y by cubres, PikaPika999
Hey everyone!

The competition is not open yet due to technical difficulties. We apologize for the delay, and will open it as soon as possible!

This is a reminder that applications are due April 26th, 2025 (by 11:59 p.m. PST) and that winners will be announced on June 28, 2025, during an online award ceremony. We hope you are excited about the amazing prizes we have in store!
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angie.
318 posts
angie.
#18 h  Mar 25, 2025, 1:37 AM • 3 Y
Y by KnowingAnt, cubres, PikaPika999
Hey everyone!

The 2025 MA4G competition is now open! Visit https://www.mathandai4girls.org/ to get started!

With the contest having opened, we will be hosting an info session via Zoom on March 30th, 2025 at 4 PM CT/5 PM ET/2 PM PT.

The info session will last around an hour, and we'll be introducing our team, discussing this year's application, and answering any questions that you may have.

If you're an eligible participant interested in attending the info session, please fill out this short form with your email so that we can send you the Zoom link.

Feel free to PM or email mathandai4girls@yahoo.com if you have any questions!
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mkwhe
168 posts
mkwhe
#19 h  Mar 28, 2025, 9:43 PM • 2 Y
Y by cubres, PikaPika999
Please join the MA4G Info Session this Sunday! We will be answering all of your questions and more!
Sign up here for the info session: https://docs.google.com/forms/d/e/1FAIpQLSdQHBMB5mHCoZ3dpCfm21LL0q-qYIW1M3T2l_Fjz_zcwSfE8w/viewform

Click here to apply for the competition: https://xmathandai4girls.submittable.com/submit
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FIFITHECAT
39 posts
FIFITHECAT
#20 h  Mar 29, 2025, 9:29 PM • 2 Y
Y by cubres, PikaPika999
Super excited for this year's contest! Good luck to all of the contestants :)
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