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Contests & Programs AMC and other contests, summer programs, etc.
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k a May Highlights and 2025 AoPS Online Class Information
jlacosta   0
May 1, 2025
May is an exciting month! National MATHCOUNTS is the second week of May in Washington D.C. and our Founder, Richard Rusczyk will be presenting a seminar, Preparing Strong Math Students for College and Careers, on May 11th.

Are you interested in working towards MATHCOUNTS and don’t know where to start? We have you covered! If you have taken Prealgebra, then you are ready for MATHCOUNTS/AMC 8 Basics. Already aiming for State or National MATHCOUNTS and harder AMC 8 problems? Then our MATHCOUNTS/AMC 8 Advanced course is for you.

Summer camps are starting next month at the Virtual Campus in math and language arts that are 2 - to 4 - weeks in duration. Spaces are still available - don’t miss your chance to have an enriching summer experience. 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 upcoming events:
[list][*]May 9th, 4:30pm PT/7:30pm ET, Casework 2: Overwhelming Evidence — A Text Adventure, a game where participants will work together to navigate the map, solve puzzles, and win! All are welcome.
[*]May 19th, 4:30pm PT/7:30pm ET, What's Next After Beast Academy?, designed for students finishing Beast Academy and ready for Prealgebra 1.
[*]May 20th, 4:00pm PT/7:00pm ET, Mathcamp 2025 Qualifying Quiz Part 1 Math Jam, Problems 1 to 4, join the Canada/USA Mathcamp staff for this exciting Math Jam, where they discuss solutions to Problems 1 to 4 of the 2025 Mathcamp Qualifying Quiz!
[*]May 21st, 4:00pm PT/7:00pm ET, Mathcamp 2025 Qualifying Quiz Part 2 Math Jam, Problems 5 and 6, Canada/USA Mathcamp staff will discuss solutions to Problems 5 and 6 of the 2025 Mathcamp Qualifying Quiz![/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
May 1, 2025
0 replies
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
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
Cyclic Quad. and Intersections
Thelink_20   11
N an hour ago by americancheeseburger4281
Source: My Problem
Let $ABCD$ be a quadrilateral inscribed in a circle $\Gamma$. Let $AC\cap BD=E$, $AB\cap CD=F$, $(AEF)\cap\Gamma=X$, $(BEF)\cap\Gamma=Y$, $(CEF)\cap\Gamma=Z$, $(DEF)\cap\Gamma=W$, $XZ\cap YW=M$, $XY\cap ZW=N$. Prove that $MN$ lies over $EF$.
11 replies
Thelink_20
Oct 29, 2024
americancheeseburger4281
an hour ago
Serbian selection contest for the IMO 2025 - P6
OgnjenTesic   15
N an hour ago by math90
Source: Serbian selection contest for the IMO 2025
For an $n \times n$ table filled with natural numbers, we say it is a divisor table if:
- the numbers in the $i$-th row are exactly all the divisors of some natural number $r_i$,
- the numbers in the $j$-th column are exactly all the divisors of some natural number $c_j$,
- $r_i \ne r_j$ for every $i \ne j$.

A prime number $p$ is given. Determine the smallest natural number $n$, divisible by $p$, such that there exists an $n \times n$ divisor table, or prove that such $n$ does not exist.

Proposed by Pavle Martinović
15 replies
OgnjenTesic
May 22, 2025
math90
an hour ago
Easy Number Theory
math_comb01   39
N an hour ago by Adywastaken
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
39 replies
math_comb01
Jan 21, 2024
Adywastaken
an hour ago
Painting Beads on Necklace
amuthup   46
N an hour ago by quantam13
Source: 2021 ISL C2
Let $n\ge 3$ be a fixed integer. There are $m\ge n+1$ beads on a circular necklace. You wish to paint the beads using $n$ colors, such that among any $n+1$ consecutive beads every color appears at least once. Find the largest value of $m$ for which this task is $\emph{not}$ possible.

Carl Schildkraut, USA
46 replies
amuthup
Jul 12, 2022
quantam13
an hour ago
Iran geometry
Dadgarnia   38
N 2 hours ago by cursed_tangent1434
Source: Iranian TST 2018, first exam day 2, problem 4
Let $ABC$ be a triangle ($\angle A\neq 90^\circ$). $BE,CF$ are the altitudes of the triangle. The bisector of $\angle A$ intersects $EF,BC$ at $M,N$. Let $P$ be a point such that $MP\perp EF$ and $NP\perp BC$. Prove that $AP$ passes through the midpoint of $BC$.

Proposed by Iman Maghsoudi, Hooman Fattahi
38 replies
Dadgarnia
Apr 8, 2018
cursed_tangent1434
2 hours ago
hard problem (to me)
kjhgyuio   2
N 2 hours ago by kjhgyuio
........
2 replies
kjhgyuio
Apr 19, 2025
kjhgyuio
2 hours ago
PE is bisector of BPC
goldeneagle   44
N 2 hours ago by cursed_tangent1434
Source: Iran TST 2012 -first day- problem 2
Consider $\omega$ is circumcircle of an acute triangle $ABC$. $D$ is midpoint of arc $BAC$ and $I$ is incenter of triangle $ABC$. Let $DI$ intersect $BC$ in $E$ and $\omega$ for second time in $F$. Let $P$ be a point on line $AF$ such that $PE$ is parallel to $AI$. Prove that $PE$ is bisector of angle $BPC$.

Proposed by Mr.Etesami
44 replies
goldeneagle
Apr 23, 2012
cursed_tangent1434
2 hours ago
find question
mathematical-forest   9
N 2 hours ago by JARP091
Are there any contest questions that seem simple but are actually difficult? :-D
9 replies
mathematical-forest
May 29, 2025
JARP091
2 hours ago
Interesting inequality
sqing   1
N 2 hours ago by Zok_G8D
Source: Own
Let $  a, b,c>0,b+c\geq 3a$. Prove that
$$ \sqrt{\frac{a}{b+c-a}}-\frac{ 2a^2-b^2-c^2}{(a+b)(a+c)}\geq \frac{2}{5}+\frac{1}{\sqrt 2}$$$$ \frac{3}{2}\sqrt{\frac{a}{b+c-a}}-\frac{ 2a^2-b^2-c^2}{(a+b)(a+c)}\geq \frac{2}{5}+\frac{3}{2\sqrt 2}$$
1 reply
sqing
Yesterday at 2:49 AM
Zok_G8D
2 hours ago
Basic ideas in junior diophantine equations
Maths_VC   6
N 2 hours ago by Adywastaken
Source: Serbia JBMO TST 2025, Problem 3
Determine all positive integers $a, b$ and $c$ such that
$2$ $\cdot$ $10^a + 5^b = 2025^c$
6 replies
Maths_VC
May 27, 2025
Adywastaken
2 hours ago
AIME qual outside US?
daijobu   10
N Today at 5:23 AM by Yiyj
Can students outside the US take the AIME if they earn a qualifying score?
10 replies
daijobu
Yesterday at 7:10 PM
Yiyj
Today at 5:23 AM
[$10K+ IN PRIZES] Poolesville Math Tournament (PVMT) 2025
qwerty123456asdfgzxcvb   20
N Today at 2:13 AM by panda2018
Hi everyone!

After the resounding success of the first three years of PVMT, the Poolesville High School Math Team is excited to announce the fourth annual Poolesville High School Math Tournament (PVMT)! The PVMT team includes a MOPper and multiple USA(J)MO and AIME qualifiers!

PVMT is open to all 6th-9th graders in the country (including rising 10th graders). Students will compete in teams of up to 4 people, and each participant will take three subject tests as well as the team round. The contest is completely free, and will be held virtually on June 7, 2025, from 10:00 AM to 4:00 PM (EST).

Additionally, thanks to our sponsors, we will be awarding approximately $10K+ worth of prizes (including gift cards, Citadel merch, AoPS coupons, Wolfram licenses) to top teams and individuals. More details regarding the actual prizes will be released as we get closer to the competition date.

Further, newly for this year we might run some interesting mini-events, which we will announce closer to the competition date, such as potentially a puzzle hunt and integration bee!

If you would like to register for the competition, the registration form can be found at https://pvmt.org/register.html or https://tinyurl.com/PVMT25.

Additionally, more information about PVMT can be found at https://pvmt.org

If you have any questions not answered in the below FAQ, feel free to ask in this thread or email us at falconsdomath@gmail.com!

We look forward to your participation!

FAQ
20 replies
qwerty123456asdfgzxcvb
Apr 5, 2025
panda2018
Today at 2:13 AM
Expression is a Cube
nosaj   38
N Today at 1:42 AM by NicoN9
Source: 2015 AIME I Problem 3
There is a prime number $p$ such that $16p+1$ is the cube of a positive integer. Find $p$.
38 replies
nosaj
Mar 20, 2015
NicoN9
Today at 1:42 AM
EGMO (geo) Radical Center Question
gulab_jamun   9
N Today at 12:58 AM by MathRook7817
For this theorem, Evan says that the power of point $P$ with respect to $\omega_1$ is greater than 0 if $P$ lies between $A$ and $B$. (I've underlined it). But, I'm a little confused as I thought the power was $OP^2 - r^2$ and since $P$ is inside the circle, wouldn't the power be negative since $OP < r$?
9 replies
gulab_jamun
May 25, 2025
MathRook7817
Today at 12:58 AM
Mathcounts state
happymoose666   40
N May 8, 2025 by ZMB038
Hi everyone,
I just have a question. I live in PA and I sadly didn't make it to nationals this year. Is PA a competitive state? I'm new into mathcounts and not sure
40 replies
happymoose666
Mar 24, 2025
ZMB038
May 8, 2025
Mathcounts state
G H J
G H BBookmark kLocked kLocked NReply
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happymoose666
345 posts
#1 • 2 Y
Y by PikaPika999, nmlikesmath
Hi everyone,
I just have a question. I live in PA and I sadly didn't make it to nationals this year. Is PA a competitive state? I'm new into mathcounts and not sure
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programjames1
3046 posts
#2 • 2 Y
Y by PikaPika999, nmlikesmath
Pennsylvania is about median in difficulty. See the cutoff map from last year.
This post has been edited 1 time. Last edited by programjames1, Mar 24, 2025, 10:38 PM
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Andyluo
1008 posts
#3 • 3 Y
Y by programjames1, PikaPika999, nmlikesmath
programjames1 wrote:
Pennsylvania is about median in difficulty. See the cutoff map from last year.

this data is skewed because generally bad states wouldn't post their scores.

Here, Ohio and PA are both shown to be slightly below average, but they both placed 14th and 18th out of 50 states and 6 territories.
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BossLu99
1402 posts
#4 • 1 Y
Y by nmlikesmath
happymoose666 wrote:
Hi everyone,
I just have a question. I live in PA and I sadly didn't make it to nationals this year. Is PA a competitive state? I'm new into mathcounts and not sure

hey yo whats ur name im in PA too
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programjames1
3046 posts
#5 • 1 Y
Y by nmlikesmath
Andyluo wrote:
this data is skewed because generally bad states wouldn't post their scores.

Here, Ohio and PA are both shown to be slightly below average, but they both placed 14th and 18th out of 50 states and 6 territories.

Cutoffs are different from top scorers though. I did MATHCOUNTS in two states, each of which typically ranked between 20th and 30th, and had cutoffs one or two points lower than Pennsylvanias. The difference between those states and Pennsylvania is the scores were much closer together.
This post has been edited 2 times. Last edited by programjames1, Mar 24, 2025, 11:06 PM
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happymoose666
345 posts
#7 • 1 Y
Y by nmlikesmath
BossLu99 wrote:
happymoose666 wrote:
Hi everyone,
I just have a question. I live in PA and I sadly didn't make it to nationals this year. Is PA a competitive state? I'm new into mathcounts and not sure

hey yo whats ur name im in PA too

Is your name benjamin Lu
Z K Y
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Math-lover1
371 posts
#8 • 1 Y
Y by nmlikesmath
happymoose666 wrote:
BossLu99 wrote:
happymoose666 wrote:
Hi everyone,
I just have a question. I live in PA and I sadly didn't make it to nationals this year. Is PA a competitive state? I'm new into mathcounts and not sure

hey yo whats ur name im in PA too

Is your name benjamin Lu

yes he is
Benorz the GOAT

btw I'm the norz viktor wang
Z K Y
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happymoose666
345 posts
#9 • 1 Y
Y by nmlikesmath
he got second
Z K Y
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Pengu14
638 posts
#10 • 1 Y
Y by nmlikesmath
viktorz :omighty:
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ethan2011
352 posts
#11 • 1 Y
Y by nmlikesmath
happymoose666 wrote:
he got second

he got 1st written, 2nd cdr, so i'd say he got 1st
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nmlikesmath
526 posts
#12
Y by
the amount of orzness coming from this post is so high its dangerous
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nmlikesmath
526 posts
#13
Y by
bruh my california chapter is so hard I got 39 and was like 1 away from state qual :wallbash_red:
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fxx11
51 posts
#14 • 1 Y
Y by nmlikesmath
@happymoose666 what grade are you in
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Math-lover1
371 posts
#15 • 1 Y
Y by nmlikesmath
ethan2011 wrote:
happymoose666 wrote:
he got second

he got 1st written, 2nd cdr, so i'd say he got 1st

wait are you Ethan qi
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ethan2011
352 posts
#16 • 1 Y
Y by nmlikesmath
Math-lover1 wrote:
ethan2011 wrote:
happymoose666 wrote:
he got second

he got 1st written, 2nd cdr, so i'd say he got 1st

wait are you Ethan qi

no
I don't live in pa
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fxx11
51 posts
#17 • 1 Y
Y by nmlikesmath
happymoose666 wrote:
Hi everyone,
I just have a question. I live in PA and I sadly didn't make it to nationals this year. Is PA a competitive state? I'm new into mathcounts and not sure

r u Shawn Ruan?
Z K Y
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orangebear
724 posts
#18 • 1 Y
Y by nmlikesmath
Pengu14 wrote:
viktorz :omighty:

You mean you orz
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Cerberusman
317 posts
#19 • 1 Y
Y by nmlikesmath
orangebear wrote:
Pengu14 wrote:
viktorz :omighty:

You mean you orz

Off topic but I love your pfp :10:
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Math-lover1
371 posts
#20 • 1 Y
Y by nmlikesmath
fxx11 wrote:
happymoose666 wrote:
Hi everyone,
I just have a question. I live in PA and I sadly didn't make it to nationals this year. Is PA a competitive state? I'm new into mathcounts and not sure

r u Shawn Ruan?

no he isn't based off chapter score
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BossLu99
1402 posts
#22
Y by
who is happy moose bro
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ZMB038
296 posts
#23
Y by
@Bosslu99 good luck at nats, you were really good in states.
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happymoose666
345 posts
#24
Y by
ZMB038 wrote:
@Bosslu99 good luck at nats, you were really good in states.

Who are you???
I'm from springhouse
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ZMB038
296 posts
#25
Y by
I'm just a random 6th grader who went to states but did not make cdr :wallbash: .
My chapter is SUPER easy.
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ZMB038
296 posts
#26 • 1 Y
Y by Math-lover1
happy moose are you John Xie, or Robert Zhou?
This post has been edited 1 time. Last edited by ZMB038, Apr 23, 2025, 7:39 PM
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Math-lover1
371 posts
#27
Y by
ZMB038 wrote:
happy moose are you John Xie, or Robert Zhou?

Pretty sure orangebear is John Xie, I know he got CDR (9th-10th) range
This post has been edited 1 time. Last edited by Math-lover1, Apr 25, 2025, 12:29 AM
Reason: edit edit
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ZMB038
296 posts
#28
Y by
Math-lover1 wrote:
ZMB038 wrote:
happy moose are you John Xie, or Robert Zhou?

Pretty sure orangebear is John Xie, I know he got CDR (9th-10th) range

Thanks math-lover1/vicktor wamg
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BossLu99
1402 posts
#29
Y by
ZMB038 wrote:
@Bosslu99 good luck at nats, you were really good in states.

thanks bro
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ZMB038
296 posts
#30
Y by
yeah ofc
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LostRiptide
29 posts
#31
Y by
happymoose666 wrote:
Hi everyone,
I just have a question. I live in PA and I sadly didn't make it to nationals this year. Is PA a competitive state? I'm new into mathcounts and not sure

I'd say the best 2-3 people are quite competitive but the competitiveness generally falls off fast for PA.
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tikachaudhuri
86 posts
#32
Y by
Nice I’m from PA too and I also didn’t make nats :D

Afaik BossLu, orangebear, and MathLover are all cdr people
This post has been edited 1 time. Last edited by tikachaudhuri, Apr 29, 2025, 8:02 PM
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tikachaudhuri
86 posts
#33
Y by
ZMB038 wrote:
happy moose are you John Xie, or Robert Zhou?

not Robert Zhou… :skull: \jk
This post has been edited 1 time. Last edited by tikachaudhuri, Apr 29, 2025, 8:03 PM
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orangebear
724 posts
#34
Y by
tikachaudhuri wrote:
ZMB038 wrote:
happy moose are you John Xie, or Robert Zhou?

not Robert Zhou… :skull: \jk

Oh now I know who you are.
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neeyakkid23
132 posts
#35
Y by
Math-lover1 wrote:
happymoose666 wrote:
Is your name benjamin Lu
yes he is
Benorz the GOAT
why are you glazing this ben jit so hard
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tikachaudhuri
86 posts
#36
Y by
Robert Zhou beat me in cdr chapter and then he beat me at cdr state :skull
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ZMB038
296 posts
#37
Y by
tikachaudhuri wrote:
Robert Zhou beat me in cdr chapter and then he beat me at cdr state :skull

Tika Chaudhuri, Ben Lu, and Robert Zhou are all from the same chapter. Delaware County Chapter in PA is goated.
This post has been edited 1 time. Last edited by ZMB038, May 3, 2025, 6:26 PM
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fxx11
51 posts
#38 • 1 Y
Y by happypi31415
trust in centre county chapter
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happypi31415
757 posts
#39
Y by
fxx11 wrote:
trust in centre county chapter

i can confirm that central will be pretty strong next year :maybe:
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Math-lover1
371 posts
#40
Y by
LostRiptide wrote:

I'd say the best 2-3 people are quite competitive but the competitiveness generally falls off fast for PA.

ouch that hurt
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tikachaudhuri
86 posts
#41
Y by
Math-lover1 wrote:
LostRiptide wrote:

I'd say the best 2-3 people are quite competitive but the competitiveness generally falls off fast for PA.

ouch that hurt

(Math-lover1 got 7th so that's why he's saying that)

Viktorz
This post has been edited 1 time. Last edited by tikachaudhuri, May 7, 2025, 1:40 AM
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Inaaya
423 posts
#42
Y by
ZMB038 wrote:
tikachaudhuri wrote:
Robert Zhou beat me in cdr chapter and then he beat me at cdr state :skull

Tika Chaudhuri, Ben Lu, and Robert Zhou are all from the same chapter. Delaware County Chapter in PA is goated.

i can personally confirm that Tika Chaudhuri is goated
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ZMB038
296 posts
#44
Y by
Inaaya wrote:
ZMB038 wrote:
tikachaudhuri wrote:
Robert Zhou beat me in cdr chapter and then he beat me at cdr state :skull

Tika Chaudhuri, Ben Lu, and Robert Zhou are all from the same chapter. Delaware County Chapter in PA is goated.

i can personally confirm that Tika Chaudhuri is goated

YES! Like I know her, and she thinks she is a failure! If she is a failure what am I?
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