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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]
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0 replies
jlacosta
May 1, 2025
0 replies
Inequalities
sqing   0
4 hours ago
Let $a,b,c,d>0,a^2 + d^2-ad = (b + c)^2 $ aand $ a^2 + b^2 = c^2 + d^2.$ Prove that$$ \frac{ab+cd}{ad+bc} \geq \frac{ 4}{5}$$
0 replies
sqing
4 hours ago
0 replies
Largest Prime Factor
P162008   3
N 4 hours ago by maromex
The largest prime factor of the sum $\sum_{k=1}^{11} k^5$ is $\lambda.$ Find the sum of the digits of $\lambda.$
3 replies
P162008
Yesterday at 12:04 AM
maromex
4 hours ago
Inequalities
sqing   27
N 4 hours ago by sqing
Let $ a,b>0   $ . Prove that
$$ \frac{a}{a^2+a +2b+1}+ \frac{b}{b^2+2a +b+1}  \leq  \frac{2}{5} $$$$ \frac{a}{a^2+2a +b+1}+ \frac{b}{b^2+a +2b+1}  \leq  \frac{2}{5} $$
27 replies
sqing
May 13, 2025
sqing
4 hours ago
Wrong Answer on a Street Math Challenge
miguel00   2
N 5 hours ago by miguel00
Hello AoPS Community,

I was just watching this video link (those of you that are Korean, you should watch it!) but I came across a pretty hard vector geometry problem (keep in mind contestants have to solve this problem in 5 minutes). No one got this problem (no surprise there) but I am posting because I actually think the answer he gave is wrong.

So the problem goes like this: Referencing the diagram attached, there are three externally tangent circles $C_1, C_2, C_3$ on a plane with centers $O_1, O_2, O_3$, respectively. $H$ is feet of the perpendicular from $O_1$ to $O_2O_3$ and $A$ and $B$ are intersections of line $O_1H$ with circle $C_1$. Points $P$ and $Q$ can move around the circle $C_2$ and $C_3$, respectively. Find the maximum possible value of $|\overrightarrow{AQ}+\overrightarrow{PB}|$.


I got my answer but the video said their 1st answer but they later corrected it on the comments to their 2nd answer. I'll let you guys attempt the problem and will give my solution shortly after. Thanks in advance!

-miguel00
2 replies
miguel00
5 hours ago
miguel00
5 hours ago
Divisors of factorials can't be always products of consecutive integers
Johann Peter Dirichlet   0
5 hours ago
Let $M$ an even number.

Show that $\frac{n!}{M^2}$ is not the product of consecutive integers for infinitely many naturals $n$.
0 replies
Johann Peter Dirichlet
5 hours ago
0 replies
Introducing a math summer program for middle school students
harry133   0
5 hours ago
Introducing IITSP, an online math summer program designed for middle school students over summer.

The program is designed by Professor Shubhrangshu Dasgupta from the Department of Physics at the Indian Institute of Technology Ropar (IIT Ropar).

Please check out the webpage if you are interested in.

https://www.imc-impea.org/IMC/bbs/content.php?co_id=iitsp
0 replies
harry133
5 hours ago
0 replies
2 headed arrows usage
mathprodigy2011   1
N Yesterday at 11:30 PM by alcumusftwgrind
Source: 2003 USAMO 4
I can't upload the file but I was working with someone on 2003 USAMO p4. When we saw "if and only if" I thought it meant we have to prove it both directions. However, when we looked at Evan Chen's solution after writing it out; Evan Chen used double headed arrows and left it at that. My question is, how did he use them and how do I know when I can or can not use them?
1 reply
mathprodigy2011
Yesterday at 11:09 PM
alcumusftwgrind
Yesterday at 11:30 PM
IOQM P22 2024
SomeonecoolLovesMaths   3
N Yesterday at 10:51 PM by SomeonecoolLovesMaths
In a triangle $ABC$, $\angle BAC = 90^{\circ}$. Let $D$ be the point on $BC$ such that $AB + BD = AC + CD$. Suppose $BD : DC = 2:1$. if $\frac{AC}{AB} = \frac{m + \sqrt{p}}{n}$, Where $m,n$ are relatively prime positive integers and $p$ is a prime number, determine the value of $m+n+p$.
3 replies
SomeonecoolLovesMaths
Sep 8, 2024
SomeonecoolLovesMaths
Yesterday at 10:51 PM
AP calc?
Thayaden   30
N Yesterday at 9:53 PM by Pengu14
How are we all feeling on AP calc guys?
30 replies
Thayaden
May 20, 2025
Pengu14
Yesterday at 9:53 PM
4th grader qual JMO
HCM2001   42
N Yesterday at 6:58 PM by BS2012
i mean.. whattttt??? just found out about this.. is he on aops? (i'm sure he is) where are you orz lol..
https://www.mathschool.com/blog/results/celebrating-success-douglas-zhang-is-rsm-s-youngest-usajmo-qualifier
42 replies
HCM2001
May 22, 2025
BS2012
Yesterday at 6:58 PM
Calculate the radius of a circle using sidelengths.
richminer   0
Yesterday at 6:17 PM
Given triangle ABC with incircle (I), with D being the touchpoint of (I) and BC. Let M be the tangent point of the A-Mixtilinear circle (internally tangent). A' is the reflection of A through I. Calculate the radius of the circle (MDA') using the side lengths of the triangle ABC.
0 replies
richminer
Yesterday at 6:17 PM
0 replies
Number of real roots
girishpimoli   0
Yesterday at 5:35 PM
Number of real roots of

$\displaystyle 2\sin(\theta)\cos(3\theta)\sin(5\theta)=-1$
0 replies
girishpimoli
Yesterday at 5:35 PM
0 replies
Factorization Ex.28a Q30
Obvious_Wind_1690   1
N Yesterday at 4:43 PM by Lankou
Please help with factorization. Given is the question


\begin{align*}
a(a+1)x^2+(a+b)xy-b(b-1)y^2\\
\end{align*}
And the given answer is


\begin{align*}
[(a+1)x-(b-1)y][ax+by]\\
\end{align*}
But I am unable to reach the answer.
1 reply
Obvious_Wind_1690
Yesterday at 4:17 AM
Lankou
Yesterday at 4:43 PM
Polynomials
P162008   4
N Yesterday at 4:19 PM by HAL9000sk
If $f(x)$ is a polynomial function such that $f(x) = x\sqrt{1 + (x + 1)\sqrt{1 + (x + 2)\sqrt{1 + (x + 3)\sqrt{1 + \cdots}}}}$ then

A) Degree of $f(x)$ must be greater than $2$

B) $f(-2) = 0$

C) $\sum_{r=1}^{5} \frac{1}{f(r)} = \frac{25}{42}$

D) $\sum_{r=1}^{n} \frac{1}{f(r)} = \frac{n(3n + 5)}{4(n+1)(n+2)}$
4 replies
P162008
Monday at 11:18 PM
HAL9000sk
Yesterday at 4:19 PM
contest math stuff/some advice on how to get good
pythag011   53
N Feb 10, 2021 by Andrew_maybe
Disclaimer: This entire post is my opinion, and note that my perspective blinds me from certain things, so I would appreciate any feedback.

Contest math is pretty much 33% attitude, 33% hard work, 33% luck, and 1% talent.

Basically, a lot of people actually work a lot to get good at math and don't actually learn much compared to someone who just looks at a math problem once a week or so. Probably most extreme example of this is people at high schools who study a few hours/day for math by rereading the text over and over again and doing random exercises from textbooks. That's.... a rather inefficient way of learning math.

So, do hard problems. There's more to approaching math though.

[quote="CatalystOfNostalgia"]I guess what this boils down to is that you need to appreciate the process of reaching your goals at least as much as reaching them. Whether or not you reach them shouldn't affect your appreciation in the end for what you've learned, the skills you've developed. Don't work because you want to reach a goal; work because you enjoy the work you're doing.[/quote]

This is a pretty amazing quote, because not only does it say the secret to doing well on contest math much shorter than I could ever express it in, it also doesn't mention that this is actually very helpful to doing well.

I'll try to explain why its so powerful, though reading CatalystOfNostalgia's post above probably will be much more helpful.

Treat the problems you're doing as interesting places you want to explore. Just... try to figure out everything, look at how interesting it is, see the ridiculous connections that make it tricky. Try to understand it. Don't just do a problem and forget it, the problem should be interesting, you should remember it forever, you should seek to understand it, etc...

For this, and also hard work, I recommend working with other people. It's pretty useful.

Not much you can do about having bad luck and getting a USAMO with 6 geometry problems or something, so just try to not have that happen.

Like... it's easy to think btw that you're doing everything that you could, but you don't have enough talent or some random thing like that. It's usually because you're not doing everything that you could, see if you REALLY are working on problems how you should be working.

Doing math actually takes up a lot of energy, at least for me. Makes me hungry pretty easily.

Other stuff that helps:

Books:

standard is Aopsv1->aopsv2->some aops introduction series->Art and Craft of Problem Solving by Paul Zeitz->Problem Solving Strategies->Whatever you want for olympiad level. There are a ton of good olympiad books out there, any of them should work.

Also, read some books about cool math. Math is pretty cool.

Problem Sources:

preparing for AMC/AIME is usually done best with actual AMCs/AIMEs.

Olympiad level, I highly recommend russian olympiads. other than that IMO Shortlist is pretty ok i guess, though some problems are rather... bad. China TSTs can work. So can USAMOs.

If you're just starting, getting any book is usually a pretty decent start and what I would recommend.

Finally, add math people on gmail. (Assuming they aren't super-busy and have no time to talk to you.) Being able to reach other math people and talk about math problems is pretty useful. Also they can give you pretty good problems.

Point out anything that could be written better in this post, I've historically been pretty bad at writing explanations/opinions/things in general.
53 replies
pythag011
Jan 9, 2011
Andrew_maybe
Feb 10, 2021
contest math stuff/some advice on how to get good
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pythag011
2453 posts
#1 • 57 Y
Y by yugrey, EuclidGenius, fermat007, calculus17, Zeref, UrInvalid, ssilwa, NewAlbionAcademy, icantdecide, gstenger98, Baban, application, john456852, mathcrazymj, 277546, snow_monkey, hashtagmath, Happy88, bowenying24, HIA2020, fidgetboss_4000, NamePending, RJ5303707, ihatemath123, SuperJJ, magicarrow, lethan3, cw357, player01, ThisUsernameIsTaken, Lamboreghini, Adventure10, Mango247, theSpider, and 23 other users
Disclaimer: This entire post is my opinion, and note that my perspective blinds me from certain things, so I would appreciate any feedback.

Contest math is pretty much 33% attitude, 33% hard work, 33% luck, and 1% talent.

Basically, a lot of people actually work a lot to get good at math and don't actually learn much compared to someone who just looks at a math problem once a week or so. Probably most extreme example of this is people at high schools who study a few hours/day for math by rereading the text over and over again and doing random exercises from textbooks. That's.... a rather inefficient way of learning math.

So, do hard problems. There's more to approaching math though.
CatalystOfNostalgia wrote:
I guess what this boils down to is that you need to appreciate the process of reaching your goals at least as much as reaching them. Whether or not you reach them shouldn't affect your appreciation in the end for what you've learned, the skills you've developed. Don't work because you want to reach a goal; work because you enjoy the work you're doing.

This is a pretty amazing quote, because not only does it say the secret to doing well on contest math much shorter than I could ever express it in, it also doesn't mention that this is actually very helpful to doing well.

I'll try to explain why its so powerful, though reading CatalystOfNostalgia's post above probably will be much more helpful.

Treat the problems you're doing as interesting places you want to explore. Just... try to figure out everything, look at how interesting it is, see the ridiculous connections that make it tricky. Try to understand it. Don't just do a problem and forget it, the problem should be interesting, you should remember it forever, you should seek to understand it, etc...

For this, and also hard work, I recommend working with other people. It's pretty useful.

Not much you can do about having bad luck and getting a USAMO with 6 geometry problems or something, so just try to not have that happen.

Like... it's easy to think btw that you're doing everything that you could, but you don't have enough talent or some random thing like that. It's usually because you're not doing everything that you could, see if you REALLY are working on problems how you should be working.

Doing math actually takes up a lot of energy, at least for me. Makes me hungry pretty easily.

Other stuff that helps:

Books:

standard is Aopsv1->aopsv2->some aops introduction series->Art and Craft of Problem Solving by Paul Zeitz->Problem Solving Strategies->Whatever you want for olympiad level. There are a ton of good olympiad books out there, any of them should work.

Also, read some books about cool math. Math is pretty cool.

Problem Sources:

preparing for AMC/AIME is usually done best with actual AMCs/AIMEs.

Olympiad level, I highly recommend russian olympiads. other than that IMO Shortlist is pretty ok i guess, though some problems are rather... bad. China TSTs can work. So can USAMOs.

If you're just starting, getting any book is usually a pretty decent start and what I would recommend.

Finally, add math people on gmail. (Assuming they aren't super-busy and have no time to talk to you.) Being able to reach other math people and talk about math problems is pretty useful. Also they can give you pretty good problems.

Point out anything that could be written better in this post, I've historically been pretty bad at writing explanations/opinions/things in general.
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AwesomeToad
4535 posts
#2 • 2 Y
Y by Adventure10, Mango247
pythag011 wrote:
Contest math is pretty much 33% attitude, 33% hard work, 33% luck, and 1% talent.
34%, 34%, 34%, -2% :P
pythag011 wrote:
standard is Aopsv1->aopsv2->some aops introduction series->Art and Craft of Problem Solving by Paul Zeitz->Problem Solving Strategies->Whatever you want for olympiad level. There are a ton of good olympiad books out there, any of them should work.

I'd like to add Intermediate Series in their; works for me and some other people, I guess. Volume 2 is good around that same time.

The same goes for Volume 1 and the Introduction series.
pythag011 wrote:
Olympiad level, I highly recommend russian olympiads. other than that IMO Shortlist is pretty ok i guess, though some problems are rather... bad. China TSTs can work. So can USAMOs.

I would think most of the Olympiads from different countries and even international would work fine. Okay, around the actual contest, probably do the old year's of that contest to adjust to the format, but I'm pretty sure Olympiads from other countries are of comparable difficulty to ours. I can't speak much for the ISLs...
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pythag011
2453 posts
#3 • 2 Y
Y by Adventure10, Mango247
AwesomeToad wrote:
pythag011 wrote:
Contest math is pretty much 33% attitude, 33% hard work, 33% luck, and 1% talent.
34%, 34%, 34%, -2% :P
pythag011 wrote:
standard is Aopsv1->aopsv2->some aops introduction series->Art and Craft of Problem Solving by Paul Zeitz->Problem Solving Strategies->Whatever you want for olympiad level. There are a ton of good olympiad books out there, any of them should work.

I'd like to add Intermediate Series in their; works for me and some other people, I guess. Volume 2 is good around that same time.

The same goes for Volume 1 and the Introduction series.
pythag011 wrote:
Olympiad level, I highly recommend russian olympiads. other than that IMO Shortlist is pretty ok i guess, though some problems are rather... bad. China TSTs can work. So can USAMOs.

I would think most of the Olympiads from different countries and even international would work fine. Okay, around the actual contest, probably do the old year's of that contest to adjust to the format, but I'm pretty sure Olympiads from other countries are of comparable difficulty to ours. I can't speak much for the ISLs...

Eh, there are actually not very many countries with olympiads of similar difficulty to US ones
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AwesomeToad
4535 posts
#4 • 2 Y
Y by Adventure10, Mango247
pythag011 wrote:
Eh, there are actually not very many countries with olympiads of similar difficulty to US ones

Well, I'm probably so bad at math I don't see as much difference.

I don't do a lot of other countries' olympiads either, but would you say generally more on the easier or difficult side?
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pythag011
2453 posts
#5 • 2 Y
Y by Adventure10, Mango247
AwesomeToad wrote:
pythag011 wrote:
Eh, there are actually not very many countries with olympiads of similar difficulty to US ones

Well, I'm probably so bad at math I don't see as much difference.

I don't do a lot of other countries' olympiads either, but would you say generally more on the easier or difficult side?

most countries olympiads are pretty easy

ones close to us: china russia vietnam iran, don't know of any others, though korean is supposed to be similar difficulty.
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NuncChaos
781 posts
#6 • 7 Y
Y by Ultroid999OCPN, Adventure10, and 5 other users
APMOs, Canadian, Bulgarian, Balkan MOs are all examples of "easy" olympiads.

Also @OP: about the 1% talent thing.. I think it's more like if you have more talent than a certain threshold (which tends to be overestimated a lot), any "surplus" talent/intelligience is negligible compared to working hard correctly and approaching it properly, with the right attitude and passion.
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LastPrime
122 posts
#7 • 2 Y
Y by Adventure10, Mango247
pythag011 wrote:
Finally, add math people on gmail. (Assuming they aren't super-busy and have no time to talk to you.) Being able to reach other math people and talk about math problems is pretty useful. Also they can give you pretty good problems.

Anyone wanna add me? I would love to have some math people to talk to.
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JSGandora
4216 posts
#8 • 3 Y
Y by Adventure10, Mango247, and 1 other user
NuncChaos wrote:
Also @OP: about the 1% talent thing.. I think it's more like if you have more talent than a certain threshold (which tends to be overestimated a lot), any "surplus" talent/intelligience is negligible compared to working hard correctly and approaching it properly, with the right attitude and passion.
Outliers. :P
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AwesomeToad
4535 posts
#9 • 2 Y
Y by Adventure10, Mango247
LastPrime wrote:
pythag011 wrote:
Finally, add math people on gmail. (Assuming they aren't super-busy and have no time to talk to you.) Being able to reach other math people and talk about math problems is pretty useful. Also they can give you pretty good problems.

Anyone wanna add me? I would love to have some math people to talk to.

The best way to do this is probably to go to a math camp or something :) and add your friends from there.
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SnowEverywhere
801 posts
#10 • 2 Y
Y by Adventure10, Mango247
Really? I was under the impression that APMO is generally considered to be a medium-hard contest (at least I thought that it was in Canada).
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NuncChaos
781 posts
#11 • 7 Y
Y by Adventure10, Mango247, and 5 other users
Define "hard."
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SnowEverywhere
801 posts
#12 • 2 Y
Y by Adventure10, Mango247
For example, I was under the impression that all of the problems on APMO 2009 were harder than last year's IMO and USAMO #1s and #4s.
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pythag011
2453 posts
#13 • 2 Y
Y by Adventure10, Mango247
SnowEverywhere wrote:
For example, I was under the impression that all of the problems on APMO 2009 were harder than last year's IMO and USAMO #1s and #4s.

I would argue that APMO #4/5 last year were much harder than IMO #3/#6 last year, but its my worst two subjects vs. two best, so not really a fair comparison.

APMO is probably one of the harder ones though.
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Poincare
1341 posts
#14 • 4 Y
Y by Adventure10, Mango247, and 2 other users
This is a very nice post, pythag. I like the Irish Olympiads as well, the old ones are especially good for people that are terrible at geometry.
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Differ
518 posts
#15 • 12 Y
Y by baijiangchen, Watermelon876, aopsp1, Adventure10, Mango247, and 7 other users
I've never seen this "talent" that people speak of. It's probably just a word for previous knowledge - when people begin to compete, some have seen something similar before and some haven't, and this difference can be removed in just a few hours. If you're going to blame not doing well on being innately bad at math, then go ahead, but I'm just letting you know. :)

However, bad teachers/bad studying are an entirely different matter and can really cripple you. If you're solving hard problems to practice then there shouldn't be any problem. Just make sure to read other people's solutions occasionally to learn new techniques and perhaps find flaws in your own. It's impossible to figure out everything by yourself.

About the process/result stuff: I actually care very little about my placement in competitions. What's important to me are the interesting problems and the interesting people, and it happens that those who do well can solve more interesting problems and meet more interesting people.

If your goal is to make USAMO or something just for the prestige, then you might work hard for a while, but you will definitely burn out before making it very far. I would advise you then to switch over to one of the other olympiads such as IPhO, because you can win a gold medal with maybe three or four weeks of studying, and then everyone except math competitors will look up to you. It's an excellent career choice.
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