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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
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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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How important is math "intuition"
Dream9   1
N 18 minutes ago by Amazingatmath.com
When I see problems now, they usually fall under 3 categories: easy, annoying, and cannot solve. Over time, more problems become easy, but I don't think I'm learning anything "new" so is higher level math like AMC 10 more about practice, so you know what to do when you see a problem? Of course, there's formulas for some problems but when reading a lot of solutions I didn't see many weird formulas being used and it was just the way to solve the problem was "odd".
1 reply
Dream9
5 hours ago
Amazingatmath.com
18 minutes ago
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Boxes & Balls
tpulak   1
N 23 minutes ago by markusuuii
Heres the problem :

"The dimensions of 2 boxes are A by B by C, and D by E by F, respectively. If A<C, D<B, E<A, B<E, and A<F, what is the diameter of the largest largest ball that can fit into both boxes? Express your answer in terms of A,B,C,D,E,F, and/or F"
1 reply
tpulak
Dec 1, 2007
markusuuii
23 minutes ago
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classical R+ FE
jasperE3   2
N an hour ago by jasperE3
Source: kent2207, based on 2019 Slovenia TST
wanted to post this problem in its own thread: https://artofproblemsolving.com/community/c6h1784825p34307772
Find all functions $f:\mathbb R^+\to\mathbb R^+$ for which:
$$f(f(x)+f(y))=yf(1+yf(x))$$for all $x,y\in\mathbb R^+$.
2 replies
jasperE3
Yesterday at 3:55 PM
jasperE3
an hour ago
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Geometry
srnjbr   0
an hour ago
in triangle abc, we know that bac=60. the circumcircle of the center i is tangent to the sides ab and ac at points e and f respectively. the midpoint of side bc is called m. if lines bi and ci intersect line ef at points p and q respectively, show that pmq is equilateral.
0 replies
srnjbr
an hour ago
0 replies
J
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JBMO Shortlist 2021 N1
Lukaluce   14
N an hour ago by ali123456
Source: JBMO Shortlist 2021
Find all positive integers $a, b, c$ such that $ab + 1$, $bc + 1$, and $ca + 1$ are all equal to
factorials of some positive integers.

Proposed by Nikola Velov, Macedonia
14 replies
Lukaluce
Jul 2, 2022
ali123456
an hour ago
J
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Very easy inequality
pggp   2
N an hour ago by ali123456
Source: Polish Junior MO Second Round 2019
Let $x$, $y$ be real numbers, such that $x^2 + x \leq y$. Prove that $y^2 + y \geq x$.
2 replies
pggp
Oct 26, 2020
ali123456
an hour ago
J
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Problem about Euler's function
luutrongphuc   1
N an hour ago by ishan.panpaliya
Prove that for every integer $n \ge 5$, we have:
$$ 2^{n^2+3n-13} \mid \phi \left(2^{2^{n}}-1 \right)$$
1 reply
luutrongphuc
3 hours ago
ishan.panpaliya
an hour ago
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Problem 5
blug   1
N an hour ago by WallyWalrus
Source: Polish Junior Math Olympiad Finals 2025
Each square on a 5×5 board contains an arrow pointing up, down, left, or right. Show that it is possible to remove exactly 20 arrows from this board so that no two of the remaining five arrows point to the same square.
1 reply
blug
Mar 15, 2025
WallyWalrus
an hour ago
J
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Cool Number Theory
Fermat_Fanatic108   6
N 2 hours ago by epl1
For an integer with 5 digits $n=abcde$ (where $a, b, c, d, e$ are the digits and $a\neq 0$) we define the \textit{permutation sum} as the value $$bcdea+cdeab+deabc+eabcd$$For example the permutation sum of 20253 is $$02532+25320+53202+32025=113079$$Let $m$ and $n$ be two fivedigit integers with the same permutation sum.
Prove that $m=n$.
6 replies
Fermat_Fanatic108
5 hours ago
epl1
2 hours ago
J
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Incenter geometry with parallel lines
nAalniaOMliO   1
N 2 hours ago by LenaEnjoyer
Source: Belarusian MO 2023
Let $\omega$ be the incircle of triangle $ABC$. Line $l_b$ is parallel to side $AC$ and tangent to $\omega$. Line $l_c$ is parallel to side $BC$ and tangent to $\omega$. It turned out that the intersection point of $l_b$ and $l_c$ lies on circumcircle of $ABC$
Find all possible values of $\frac{AB+AC}{BC}$
1 reply
nAalniaOMliO
Apr 16, 2024
LenaEnjoyer
2 hours ago
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Angle problem
FlyingDragon21   14
N 2 hours ago by fruitmonster97
In Isosceles triangle ABC where AB equals AC and point D lies on line AB, line CD splits line AB so that AD equals BC. If angle BAC is 20 degrees, what is the measure of angle DCA?
14 replies
FlyingDragon21
Yesterday at 11:36 PM
fruitmonster97
2 hours ago
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AMC 8 Help
krish6_9   22
N 2 hours ago by SpeedCuber7
Hey guys
im in new jersey a third grader who got 12 on amc 8. I want to make mop in high school and mathcounts nationals in 6th grade is that realistic how should I get better
22 replies
krish6_9
Mar 17, 2025
SpeedCuber7
2 hours ago
J
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Problem for VASC, SI Book
hungkhtn   21
N 3 hours ago by imnotgoodatmathsorry
Source: please let him prove it first
Let $a,b,c$ be non-negative real numbers such that $a+b+c=3$. Prove that
\[a\sqrt{1+b^{3}}+b\sqrt{1+c^{3}}+c\sqrt{1+a^{3}}\le 5.\]
21 replies
hungkhtn
Jun 5, 2007
imnotgoodatmathsorry
3 hours ago
J
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IMO Shortlist 2009 - Problem N4
April   12
N 3 hours ago by asdf334
Find all positive integers $n$ such that there exists a sequence of positive integers $a_1$, $a_2$,$\ldots$, $a_n$ satisfying: \[a_{k+1}=\frac{a_k^2+1}{a_{k-1}+1}-1\] for every $k$ with $2\leq k\leq n-1$.

Proposed by North Korea
12 replies
April
Jul 5, 2010
asdf334
3 hours ago
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ohio mathcounts state
Owinner   38
N Monday at 9:35 PM by Andyluo
what is the cutoff for cdr for ohio? Is ohio a competitve state?
38 replies
Owinner
Mar 11, 2025
Andyluo
Monday at 9:35 PM
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ohio mathcounts state
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Reveal topic tags
MATHCOUNTS
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Owinner
48 posts
Owinner
#1 h  Mar 11, 2025, 10:52 PM • 1 Y
Y by master_Eric_chill
what is the cutoff for cdr for ohio? Is ohio a competitve state?
Z K Y
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MC_ADe
169 posts
MC_ADe
#2 h  Mar 11, 2025, 11:18 PM
Y by
blud cdr for which year and Ohio is usually a semi competitive state and this year it's definitely also semi competitive
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Leeoz
143 posts
Leeoz
#3 h  Mar 12, 2025, 1:07 AM • 2 Y
Y by Ash_the_Bash07, mathlover3141
only in ohio
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bjump
965 posts
bjump
#4 h  Mar 12, 2025, 1:11 AM • 1 Y
Y by DreamineYT
Owinner wrote:
what is the cutoff for cdr for ohio? Is ohio a competitve state?

Back in 2023 when I took states the CDR cutoff was 28 (with tiebreaks) and the nats cutoff was 33. Ohio is mid rn. There is like one or two people in middle school who are near jmo level, but competition isn't super intense. ( I made nats in 2023 )
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Pi_isCool31415
23 posts
Pi_isCool31415
#5 h  Mar 13, 2025, 3:23 AM
Y by
andyluo is competition i could say
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jkim0656
272 posts
jkim0656
#6 h  Mar 13, 2025, 3:25 AM
Y by
does he live in ohio?
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aoh11
200 posts
aoh11
#7 h  Mar 13, 2025, 3:26 AM • 1 Y
Y by master_Eric_chill
i live in ohio
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Pi_isCool31415
23 posts
Pi_isCool31415
#9 h  Mar 13, 2025, 3:36 AM
Y by
jkim0656 wrote:
does he live in ohio?

ye
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DarintheBoy
264 posts
DarintheBoy
#10 h  Mar 13, 2025, 11:18 AM • 1 Y
Y by master_Eric_chill
I live in Ohio and I predict NATS cutoff to be 35. My chapter has a two time nats qual and he might get ~38.
This post has been edited 2 times. Last edited by DarintheBoy, Mar 13, 2025, 9:53 PM
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Andyluo
851 posts
Andyluo
#11 h  Mar 13, 2025, 11:32 AM • 2 Y
Y by DarintheBoy, master_Eric_chill
DarintheBoy wrote:
I live in Ohio and I predict NATS cutoff to be 36. My chapter has the two time State champ and he might get ~38.

no your chapter does NOT have the state champion, that was ayush, maybe chapter champion

henry lu orz
This post has been edited 1 time. Last edited by Andyluo, Mar 13, 2025, 11:44 AM
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bjump
965 posts
bjump
#12 h  Mar 13, 2025, 3:48 PM • 1 Y
Y by master_Eric_chill
DarintheBoy wrote:
I live in Ohio and I predict NATS cutoff to be 36. My chapter has the two time State champ and he might get ~38.

nah bruh, two years ago it was alexz, and last year it was arush
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HenryJW
42 posts
HenryJW
#13 h  Mar 13, 2025, 7:33 PM
Y by
Isn't Henry lu in Ohio lol, I remember he was really good
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parnikap
290 posts
parnikap
#14 h  Mar 13, 2025, 7:34 PM
Y by
MC_ADe wrote:
blud cdr for which year and Ohio is usually a semi competitive state and this year it's definitely also semi competitive

W pfp
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DarintheBoy
264 posts
DarintheBoy
#15 h  Mar 13, 2025, 9:28 PM
Y by
Henry Lu beat Arush in the CDR and tied in the written.
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Andyluo
851 posts
Andyluo
#16 h  Mar 13, 2025, 9:39 PM • 2 Y
Y by DarintheBoy, master_Eric_chill
DarintheBoy wrote:
Henry Lu beat Arush in the CDR and tied in the written.

no he didn't he got 3rd and got behind 2nd who's from my school, but still orz
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Mithum_math
3 posts
Mithum_math
#17 h  Mar 13, 2025, 10:42 PM • 1 Y
Y by master_Eric_chill
Im from ohio
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Mithum_math
3 posts
Mithum_math
#18 h  Mar 13, 2025, 10:44 PM • 1 Y
Y by master_Eric_chill
im getting nervous even thinking about states, even though Im not even doing states lol
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dragonwarrior20
171 posts
dragonwarrior20
#20 h  Mar 13, 2025, 11:33 PM • 3 Y
Y by Andyluo, master_Eric_chill, DarintheBoy
stop talking about me smh. also we don't talk about last year's states.
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master_Eric_chill
5 posts
master_Eric_chill
#21 h  Mar 14, 2025, 8:28 PM
Y by
I'll see you guys in Columbus.
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Bummer12345
94 posts
Bummer12345
#22 h  Mar 14, 2025, 11:42 PM
Y by
bjump wrote:
DarintheBoy wrote:
I live in Ohio and I predict NATS cutoff to be 36. My chapter has the two time State champ and he might get ~38.

nah bruh, two years ago it was alexz, and last year it was arush

wait were you friends with Justin Guo from TN?
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ohiorizzler1434
709 posts
ohiorizzler1434
#23 h  Mar 14, 2025, 11:53 PM • 1 Y
Y by exp-ipi-1
I predict the cutoff to be 46, due to the strong competition this year.
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greenplanet2050
1282 posts
greenplanet2050
#24 h  Mar 15, 2025, 12:11 AM
Y by
ohiorizzler1434 wrote:
I predict the cutoff to be 46, due to the strong competition this year.

what the heck

46 is crazy

it wont be that high
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Andyluo
851 posts
Andyluo
#25 h  Mar 15, 2025, 1:13 AM
Y by
ohiorizzler1434 wrote:
I predict the cutoff to be 46, due to the strong competition this year.

us ohioans will use our skibidiness to control our minds and conquer the spirit of luke robatille
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nmlikesmath
412 posts
nmlikesmath
#26 h  Mar 15, 2025, 2:20 AM
Y by
bro the ohio cutoff is like a 69420 bro only in ohio
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ohiorizzler1434
709 posts
ohiorizzler1434
#27 h  Mar 15, 2025, 3:03 AM • 6 Y
Y by Shadow6885, Ash_the_Bash07, Andyluo, Lhaj3, exp-ipi-1, megarnie
To everyone in the chat, I believe in you! With hard work and dedication, you can make it! Good luck for national cutoffs!
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nmlikesmath
412 posts
nmlikesmath
#28 h  Mar 15, 2025, 4:40 AM
Y by
aint no way i just saw ohiorizzler post without any brainrot words, truly a rare sighting indeed...
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mdk2013
478 posts
mdk2013
#29 h  Mar 15, 2025, 5:00 AM
Y by
Andyluo wrote:
ohiorizzler1434 wrote:
I predict the cutoff to be 46, due to the strong competition this year.

us ohioans will use our skibidiness to control our minds and conquer the spirit of luke robatille

luke robatille, omg what a legend
nmlikesmath wrote:
aint no way i just saw ohiorizzler post without any brainrot words, truly a rare sighting indeed...

indeed thas very unsightly
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MC_ADe
169 posts
MC_ADe
#30 h  Mar 15, 2025, 10:46 AM
Y by
andyluo, henry lu soorz
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Andyluo
851 posts
Andyluo
#31 h  Mar 15, 2025, 11:40 AM
Y by
gl everyone, xooks xonks rbo
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DarintheBoy
264 posts
DarintheBoy
#33 h  Mar 16, 2025, 11:39 AM
Y by
Great job @Andylou. Great job@dragonwarrior20Click to reveal hidden text.
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sultanine
686 posts
sultanine
#34 h  Mar 16, 2025, 2:48 PM
Y by
bro pls stop the brain rot stuff
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MC_ADe
169 posts
MC_ADe
#35 h  Mar 17, 2025, 1:14 PM
Y by
xiooix xor xonk
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mathlover3141
5 posts
mathlover3141
#37 h  Monday at 8:48 PM
Y by
https://artofproblemsolving.com/community/c3h3290062 they have cutoffs for different states here, some bigger states are more competitive than others. ohio is usually somewhat easy but sometimes really good students will appear and it will be hard to qualify.
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sadas123
1057 posts
sadas123
#38 h  Monday at 9:04 PM
Y by
Mathematic Genius's posts all got deleted :D
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jb2015007
1703 posts
jb2015007
#39 h  Monday at 9:04 PM
Y by
thank god bro its ragebait
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mathlover3141
5 posts
mathlover3141
#40 h  Monday at 9:12 PM
Y by
this forum is so much better without the brain rot
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tchange7575
2172 posts
tchange7575
#41 h  Monday at 9:12 PM
Y by
why is brain rot always in every thread?
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mathlover3141
5 posts
mathlover3141
#42 h  Monday at 9:13 PM
Y by
no one knows
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Andyluo
851 posts
Andyluo
#43 h  Monday at 9:35 PM
Y by
mathlover3141 wrote:
https://artofproblemsolving.com/community/c3h3290062 they have cutoffs for different states here, some bigger states are more competitive than others. ohio is usually somewhat easy but sometimes really good students will appear and it will be hard to qualify.

selection bias, the worst states won't be put on there in fear of shame. I'd say Ohio is probably a t15 state, this team is about the same as last year, and ohio got 14th last year.
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