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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
HCSSiM results
SurvivingInEnglish   65
N 15 minutes ago by NoSignOfTheta
Anyone already got results for HCSSiM? Are there any point in sending additional work if I applied on March 19?
65 replies
SurvivingInEnglish
Apr 5, 2024
NoSignOfTheta
15 minutes ago
camp/class recommendations for incoming freshman
walterboro   3
N 20 minutes ago by Panda729
hi guys, i'm about to be an incoming freshman, does anyone have recommendations for classes to take next year and camps this summer? i am sure that i can aime qual but not jmo qual yet. ty
3 replies
+1 w
walterboro
3 hours ago
Panda729
20 minutes ago
Diophantine
TheUltimate123   31
N 3 hours ago by SomeonecoolLovesMaths
Source: CJMO 2023/1 (https://aops.com/community/c594864h3031323p27271877)
Find all triples of positive integers \((a,b,p)\) with \(p\) prime and \[a^p+b^p=p!.\]
Proposed by IndoMathXdZ
31 replies
TheUltimate123
Mar 29, 2023
SomeonecoolLovesMaths
3 hours ago
Cyclic ine
m4thbl3nd3r   1
N 3 hours ago by arqady
Let $a,b,c>0$ such that $a^2+b^2+c^2=3$. Prove that $$\sum \frac{a^2}{b}+abc \ge 4$$
1 reply
m4thbl3nd3r
Today at 3:34 PM
arqady
3 hours ago
Non-homogenous Inequality
Adywastaken   7
N 3 hours ago by ehuseyinyigit
Source: NMTC 2024/7
$a, b, c\in \mathbb{R_{+}}$ such that $ab+bc+ca=3abc$. Show that $a^2b+b^2c+c^2a \ge 2(a+b+c)-3$. When will equality hold?
7 replies
Adywastaken
Today at 3:42 PM
ehuseyinyigit
3 hours ago
FE with devisibility
fadhool   2
N 3 hours ago by ATM_
if when i solve an fe that is defined in the set of positive integer i found m|f(m) can i set f(m) =km such that k is not constant and of course it depends on m but after some work i find k=c st c is constant is this correct
2 replies
fadhool
6 hours ago
ATM_
3 hours ago
Japan MO Finals 2023
parkjungmin   2
N 3 hours ago by parkjungmin
It's hard. Help me
2 replies
parkjungmin
Yesterday at 2:35 PM
parkjungmin
3 hours ago
Iranian geometry configuration
Assassino9931   2
N 4 hours ago by Captainscrubz
Source: Al-Khwarizmi Junior International Olympiad 2025 P7
Let $ABCD$ be a cyclic quadrilateral with circumcenter $O$, such that $CD$ is not a diameter of its circumcircle. The lines $AD$ and $BC$ intersect at point $P$, so that $A$ lies between $D$ and $P$, and $B$ lies between $C$ and $P$. Suppose triangle $PCD$ is acute and let $H$ be its orthocenter. The points $E$ and $F$ on the lines $BC$ and $AD$, respectively, are such that $BD \parallel HE$ and $AC\parallel HF$. The line through $E$, perpendicular to $BC$, intersects $AD$ at $L$, and the line through $F$, perpendicular to $AD$, intersects $BC$ at $K$. Prove that the points $K$, $L$, $O$ are collinear.

Amir Parsa Hosseini Nayeri, Iran
2 replies
Assassino9931
Today at 9:39 AM
Captainscrubz
4 hours ago
Jane street swag package? USA(J)MO
arfekete   18
N 4 hours ago by Pengu14
Hey! People are starting to get their swag packages from Jane Street for qualifying for USA(J)MO, and after some initial discussion on what we got, people are getting different things. Out of curiosity, I was wondering how they decide who gets what.
Please enter the following info:

- USAMO or USAJMO
- Grade
- Score
- Award/Medal/HM
- MOP (yes or no, if yes then color)
- List of items you got in your package

I will reply with my info as an example.
18 replies
arfekete
May 7, 2025
Pengu14
4 hours ago
9 JMO<200?
DreamineYT   1
N 4 hours ago by Shan3t
Just wanted to ask
1 reply
1 viewing
DreamineYT
4 hours ago
Shan3t
4 hours ago
f(m + n) >= f(m) + f(f(n)) - 1
orl   30
N 4 hours ago by ezpotd
Source: IMO Shortlist 2007, A2, AIMO 2008, TST 2, P1, Ukrainian TST 2008 Problem 8
Consider those functions $ f: \mathbb{N} \mapsto \mathbb{N}$ which satisfy the condition
\[ f(m + n) \geq f(m) + f(f(n)) - 1
\]
for all $ m,n \in \mathbb{N}.$ Find all possible values of $ f(2007).$

Author: Nikolai Nikolov, Bulgaria
30 replies
orl
Jul 13, 2008
ezpotd
4 hours ago
Classic Diophantine
Adywastaken   3
N 5 hours ago by Adywastaken
Source: NMTC 2024/6
Find all natural number solutions to $3^x-5^y=z^2$.
3 replies
Adywastaken
Today at 3:39 PM
Adywastaken
5 hours ago
Add d or Divide by a
MarkBcc168   25
N 5 hours ago by Entei
Source: ISL 2022 N3
Let $a > 1$ be a positive integer and $d > 1$ be a positive integer coprime to $a$. Let $x_1=1$, and for $k\geq 1$, define
$$x_{k+1} = \begin{cases}
x_k + d &\text{if } a \text{ does not divide } x_k \\
x_k/a & \text{if } a \text{ divides } x_k
\end{cases}$$Find, in terms of $a$ and $d$, the greatest positive integer $n$ for which there exists an index $k$ such that $x_k$ is divisible by $a^n$.
25 replies
MarkBcc168
Jul 9, 2023
Entei
5 hours ago
Alice and Bob play, 8x8 table, white red black, minimum n for victory
parmenides51   14
N 5 hours ago by Ilikeminecraft
Source: JBMO Shortlist 2018 C3
The cells of a $8 \times 8$ table are initially white. Alice and Bob play a game. First Alice paints $n$ of the fields in red. Then Bob chooses $4$ rows and $4$ columns from the table and paints all fields in them in black. Alice wins if there is at least one red field left. Find the least value of $n$ such that Alice can win the game no matter how Bob plays.
14 replies
parmenides51
Jul 22, 2019
Ilikeminecraft
5 hours ago
9 Practice AIME Exam
Melissa.   22
N Apr 12, 2025 by jb2015007
(This practice test is designed to be slightly harder than the real test. I would recommend you take this like a real test, using a 3 hour time limit and no calculator.)

Let me know any suggestions for improvement on test quality, difficulty, problem selection, problem placement, test topics, etc. for the next tests that I make!

Practice AIME

1.
Positive integers a, b, and c satisfy a + b + c = 49 and ab + bc + ca = 471. Find the value of the product abc.

2.
Find the integer closest to the value of (69^(1/2) + 420^(1/2))^2.

3.
Let G and A be two points that are 243 units apart. Suppose A_1 is at G, and for n > 1, A_n is the point on line GA such that A_nA_(n-1) = 243, and A_n is farther from A than G. Let L be the locus of points T such that GT + A_6T = 2025. Find the maximum possible distance from T to line GA as T varies across L.

4.
Find the value of (69 + 12 * 33^(1/2))^(1/2) + (69 - 12 * 33^(1/2))^(1/2).

5.
Find the sum of the numerator and denominator of the probability that two (not necessarily distinct) randomly chosen positive integer divisors of 900 are relatively prime, when expressed as a fraction in lowest terms.

6.
Find the limit of (1x^2 + 345x^6)/(5x^6 + 78x + 90) as x approaches infinity.

7.
Find the slope of the line tangent to the graph of y = 6x^2 + 9x + 420 at the point where y = 615 and x is positive.

8.
Find the smallest positive integer n such that the sum of the positive integer divisors of n is 1344.

9.
Find the first 3 digits after the decimal point in the decimal expansion of the square root of 911.

10.
Let n be the smallest positive integer in base 10 such that the base 2 expression of 60n contains an odd number of 1’s. Find the sum of the squares of the digits of n.

11.
Find the sum of the 7 smallest positive integers n such that n is a multiple of 7, and the repeating decimal expansion of 1/n does not have a period of 6.

12.
Let n be an integer from 1 to 999, inclusive. How many different numerators are possible when n/1000 is written as a common fraction in lowest terms?

13.
How many ways are there to divide a pile of 15 indistinguishable bricks?

14.
Let n be the unique 3-digit positive integer such that the value of the product 100n can be expressed in bases b, b + 1, b + 2, and b + 3 using only 0’s and 1’s, for some integer b > 1. Find n.

15.
For positive integers n, let f(n) be the sum of the positive integer divisors of n. Suppose a positive integer k is untouchable if there does not exist a positive integer a such that f(a) = k + a. For example, the integers 2 and 5 are untouchable, by the above definition. Find the next smallest integer after 2 and 5 that is untouchable.

Answer key:
WARNING: SPOILERS!!!
22 replies
Melissa.
Apr 8, 2025
jb2015007
Apr 12, 2025
Practice AIME Exam
G H J
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Melissa.
6 posts
#1
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9Poll:
How many questions did you solve correctly within 3 hours?
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7%
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(This practice test is designed to be slightly harder than the real test. I would recommend you take this like a real test, using a 3 hour time limit and no calculator.)

Let me know any suggestions for improvement on test quality, difficulty, problem selection, problem placement, test topics, etc. for the next tests that I make!

Practice AIME

1.
Positive integers a, b, and c satisfy a + b + c = 49 and ab + bc + ca = 471. Find the value of the product abc.

2.
Find the integer closest to the value of (69^(1/2) + 420^(1/2))^2.

3.
Let G and A be two points that are 243 units apart. Suppose A_1 is at G, and for n > 1, A_n is the point on line GA such that A_nA_(n-1) = 243, and A_n is farther from A than G. Let L be the locus of points T such that GT + A_6T = 2025. Find the maximum possible distance from T to line GA as T varies across L.

4.
Find the value of (69 + 12 * 33^(1/2))^(1/2) + (69 - 12 * 33^(1/2))^(1/2).

5.
Find the sum of the numerator and denominator of the probability that two (not necessarily distinct) randomly chosen positive integer divisors of 900 are relatively prime, when expressed as a fraction in lowest terms.

6.
Find the limit of (1x^2 + 345x^6)/(5x^6 + 78x + 90) as x approaches infinity.

7.
Find the slope of the line tangent to the graph of y = 6x^2 + 9x + 420 at the point where y = 615 and x is positive.

8.
Find the smallest positive integer n such that the sum of the positive integer divisors of n is 1344.

9.
Find the first 3 digits after the decimal point in the decimal expansion of the square root of 911.

10.
Let n be the smallest positive integer in base 10 such that the base 2 expression of 60n contains an odd number of 1’s. Find the sum of the squares of the digits of n.

11.
Find the sum of the 7 smallest positive integers n such that n is a multiple of 7, and the repeating decimal expansion of 1/n does not have a period of 6.

12.
Let n be an integer from 1 to 999, inclusive. How many different numerators are possible when n/1000 is written as a common fraction in lowest terms?

13.
How many ways are there to divide a pile of 15 indistinguishable bricks?

14.
Let n be the unique 3-digit positive integer such that the value of the product 100n can be expressed in bases b, b + 1, b + 2, and b + 3 using only 0’s and 1’s, for some integer b > 1. Find n.

15.
For positive integers n, let f(n) be the sum of the positive integer divisors of n. Suppose a positive integer k is untouchable if there does not exist a positive integer a such that f(a) = k + a. For example, the integers 2 and 5 are untouchable, by the above definition. Find the next smallest integer after 2 and 5 that is untouchable.

Answer key:
WARNING: SPOILERS!!!
Z K Y
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jkim0656
998 posts
#2
Y by
what happened to 12 on answer key?
Z K Y
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Melissa.
6 posts
#3
Y by
jkim0656 wrote:
what happened to 12 on answer key?

Oh… I lost the answer to that one. Ima try and re-solve it to see if I can get it again.
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fake123
93 posts
#4
Y by
move this to the mock contests forum
Z K Y
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Tetra_scheme
102 posts
#5
Y by
guys please make mock contests into pdfs
Z K Y
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neeyakkid23
122 posts
#6
Y by
Please latex and put into pdf
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vincentwant
1388 posts
#7
Y by
All of the second half problems are way easier except p14,15 which is just mem
This post has been edited 4 times. Last edited by vincentwant, Apr 8, 2025, 4:56 PM
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Melissa.
6 posts
#8
Y by
vincentwant wrote:
All of the second half problems are way easier except p14,15 which is just mem

Wait what is wrong with 14 and 15
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Andyluo
962 posts
#9 • 1 Y
Y by MathRook7817
latexed using https://www.text2latex.com/

Practice AIME

1.
Positive integers \( a \), \( b \), and \( c \) satisfy \( a + b + c = 49 \) and \( ab + bc + ca = 471 \). Find the value of the product \( abc \).

2.
Find the integer closest to the value of \( (69^{1/2} + 420^{1/2})^2 \).

3.
Let \( G \) and \( A \) be two points that are 243 units apart. Suppose \( A_1 \) is at \( G \), and for \( n > 1 \), \( A_n \) is the point on line \( GA \) such that \( A_nA_{n-1} = 243 \), and \( A_n \) is farther from \( A \) than \( G \). Let \( L \) be the locus of points \( T \) such that \( GT + A_6T = 2025 \). Find the maximum possible distance from \( T \) to line \( GA \) as \( T \) varies across \( L \).

4.
Find the value of \( (69 + 12 \cdot 33^{1/2})^{1/2} + (69 - 12 \cdot 33^{1/2})^{1/2} \).

5.
Find the sum of the numerator and denominator of the probability that two (not necessarily distinct) randomly chosen positive integer divisors of 900 are relatively prime, when expressed as a fraction in lowest terms.

6.
Find the limit of \( \frac{1x^2 + 345x^6}{5x^6 + 78x + 90} \) as \( x \) approaches infinity.

7.
Find the slope of the line tangent to the graph of \( y = 6x^2 + 9x + 420 \) at the point where \( y = 615 \) and \( x \) is positive.

8.
Find the smallest positive integer \( n \) such that the sum of the positive integer divisors of \( n \) is 1344.

9.
Find the first 3 digits after the decimal point in the decimal expansion of the square root of 911.

10.
Let \( n \) be the smallest positive integer in base 10 such that the base 2 expression of \( 60n \) contains an odd number of 1’s. Find the sum of the squares of the digits of \( n \).

11.
Find the sum of the 7 smallest positive integers \( n \) such that \( n \) is a multiple of 7, and the repeating decimal expansion of \( 1/n \) does not have a period of 6.

12.
Let \( n \) be an integer from 1 to 999, inclusive. How many different numerators are possible when \( n/1000 \) is written as a common fraction in lowest terms?

13.
How many ways are there to divide a pile of $15$ indistinguishable bricks?

14.
Let \( n \) be the unique 3-digit positive integer such that the value of the product \( 100n \) can be expressed in bases \( b \), \( b + 1 \), \( b + 2 \), and \( b + 3 \) using only 0’s and 1’s, for some integer \( b > 1 \). Find \( n \).

15.
For positive integers \( n \), let \( f(n) \) be the sum of the positive integer divisors of \( n \). Suppose a positive integer \( k \) is untouchable if there does not exist a positive integer \( a \) such that \( f(a) = k + a \). For example, the integers 2 and 5 are untouchable, by the above definition. Find the next smallest integer after 2 and 5 that is untouchable.
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c_double_sharp
315 posts
#10
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#6 is just the average precalc problem
#7 is free with power rule
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hashbrown2009
190 posts
#11
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I would argue this is actually easier than the recent AIME exams but I still did bad and got 13
I got #6 wrong because I am dumb
I got #15 wrong, #15 is actually decently hard
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sanaops9
833 posts
#12
Y by
personally there's quite a few problems that are straight applications of formulas or concepts (ex. #6, #7, #13, actually these might be the only ones). some of the problems are like aime difficulty tho
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mathprodigy2011
325 posts
#13
Y by
sanaops9 wrote:
personally there's quite a few problems that are straight applications of formulas or concepts (ex. #6, #7, #13, actually these might be the only ones). some of the problems are like aime difficulty tho

yea p6 is not aime style because they wouldnt directly put limits nor do they put just conceptual questions on the test
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mathprodigy2011
325 posts
#14
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mathprodigy2011 wrote:
sanaops9 wrote:
personally there's quite a few problems that are straight applications of formulas or concepts (ex. #6, #7, #13, actually these might be the only ones). some of the problems are like aime difficulty tho

yea p6 is not aime style because they wouldnt directly put limits nor do they put just conceptual questions on the test. Also p7 is just derivatives if u know it.
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hashbrown2009
190 posts
#15
Y by
mathprodigy2011 wrote:
sanaops9 wrote:
personally there's quite a few problems that are straight applications of formulas or concepts (ex. #6, #7, #13, actually these might be the only ones). some of the problems are like aime difficulty tho

yea p6 is not aime style because they wouldnt directly put limits nor do they put just conceptual questions on the test

Agreed.
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kamuii
231 posts
#16
Y by
7 (with a knowledge of derivatives) is rlly high up imo
4 is trivial IA
This post has been edited 1 time. Last edited by kamuii, Apr 9, 2025, 9:42 PM
Reason: f
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mathprodigy2011
325 posts
#17
Y by
and p9 is just outright annoying, not aime style.(also p13 should specify whether just 1 pile counts as dividing) Some feedback for this question set, would be to make very long annoying problems instead of problems that are decently tricky but conceptually easy to understand(lots of aime problems are hard just because it is hard to comprehend)
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fake123
93 posts
#18
Y by
also why si the subject distribution so bad
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NamelyOrange
508 posts
#19
Y by
mathprodigy2011 wrote:
and p9 is just outright annoying, not aime style.(also p13 should specify whether just 1 pile counts as dividing) Some feedback for this question set, would be to make very long annoying problems instead of problems that are decently tricky but conceptually easy to understand(lots of aime problems are hard just because it is hard to comprehend)

I suppose the point of this is using the fractional binomial theorem? It's still pretty annoying with it though...
This post has been edited 1 time. Last edited by NamelyOrange, Apr 10, 2025, 12:07 PM
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mathprodigy2011
325 posts
#20
Y by
NamelyOrange wrote:
mathprodigy2011 wrote:
and p9 is just outright annoying, not aime style.(also p13 should specify whether just 1 pile counts as dividing) Some feedback for this question set, would be to make very long annoying problems instead of problems that are decently tricky but conceptually easy to understand(lots of aime problems are hard just because it is hard to comprehend)

I suppose the point of this is using the fractional binomial theorem? It's still pretty annoying with it though...

yeah its just a lot of work that most people know how to do.
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martianrunner
201 posts
#21
Y by
no regular geo (just two analytical geo problems), which is odd

no complex problems

and no trig problems

wayyyy too much nt

this isnt akin to an aime
This post has been edited 1 time. Last edited by martianrunner, Apr 11, 2025, 6:03 PM
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RandomMathGuy500
58 posts
#22
Y by
way too straightforward math. It's like a school test which it shouldn't be. Especially P8+9
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jb2015007
1948 posts
#23
Y by
bro what is p13 :skull:
so unoriginal lol
even i solved
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