2025 ROSS Program

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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]
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

Mar 2, 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

AMC- IMO preparation

asyaela. 11

N 13 minutes ago by hashbrown2009

I'm a ninth grader, and I recently attempted the AMC 12, getting 18 questions correct and leaving 7 empty. I started working on Olympiad math in November and currently dedicate about two hours per day to preparation. I'm feeling a bit demotivated, but if it's possible for me to reach IMO level, I'd be willing to put in more time. How realistic is it for me to get there, and how much study would it typically take?

11 replies

asyaela.

5 hours ago

hashbrown2009

13 minutes ago

2025 ROSS Program

scls140511 15

N 20 minutes ago by akliu

Since the application has ended, are we now free to discuss the problems and stats? How do you think this year's problems are?

15 replies

+1 w

scls140511

Yesterday at 2:36 AM

akliu

20 minutes ago

Foot from vertex to Euler line

cjquines0 31

N 39 minutes ago by pUssydestroyer777

Source: 2016 IMO Shortlist G5

Let $D$ be the foot of perpendicular from $A$ to the Euler line (the line passing through the circumcentre and the orthocentre) of an acute scalene triangle $ABC$ . A circle $\omega$ with centre $S$ passes through $A$ and $D$ , and it intersects sides $AB$ and $AC$ at $X$ and $Y$ respectively. Let $P$ be the foot of altitude from $A$ to $BC$ , and let $M$ be the midpoint of $BC$ . Prove that the circumcentre of triangle $XSY$ is equidistant from $P$ and $M$ .

31 replies

cjquines0

Jul 19, 2017

pUssydestroyer777

39 minutes ago

ABMC 2025 IN-PERSON Contest (April 5th)

ilovepizza2020 4

N 43 minutes ago by mynameisjefff

The 9th annual Acton-Boxborough Math Competition (ABMC) is quickly approaching! This year's ABMC will be held in-person at RJ Grey Junior High School, Acton, MA, on April 5th, 2025. The competition includes individual rounds and a team round, in which teams of 2-4 students participate. Anyone in grade 8 or below is welcome! You must register to compete. For more information about registration and the tentative schedule, please consult our website: https://abmathcompetitions.org/2025-contest/.

We offer prizes not only to top competitors; several of our sponsor prizes and educational awards are raffled among all in-person participants. Additionally, there are separate prizes for the top-scoring elementary schoolers.

For more information, visit https://abmathcompetitions.org/, especially the 2025 Competition page.
For the mailing list, visit https://abmathcompetitions.org/contact/.

Best,
ABMC Coordinators

4 replies

1 viewing

ilovepizza2020

an hour ago

mynameisjefff

43 minutes ago

is this really supposed to be #13???

hgmium 3

N 44 minutes ago by hashbrown2009

https://artofproblemsolving.com/wiki/index.php/2022_AMC_10A_Problems/Problem_13

I managed to do all the other geo problems for that year besides this one
misplaced?

3 replies

hgmium

2 hours ago

hashbrown2009

44 minutes ago

Inequality => square

Rushil 12

N an hour ago by ohiorizzler1434

Source: INMO 1998 Problem 4

Suppose $ABCD$ is a cyclic quadrilateral inscribed in a circle of radius one unit. If $AB \cdot BC \cdot CD \cdot DA \geq 4$ , prove that $ABCD$ is a square.

12 replies

Rushil

Oct 7, 2005

ohiorizzler1434

an hour ago

p + q + r + s = 9 and p^2 + q^2 + r^2 + s^2 = 21

who 28

N 2 hours ago by asdf334

Source: IMO Shortlist 2005 problem A3

Four real numbers $p$ , $q$ , $r$ , $s$ satisfy $p+q+r+s = 9$ and $p^{2}+q^{2}+r^{2}+s^{2}= 21$ . Prove that there exists a permutation $\left(a,b,c,d\right)$ of $\left(p,q,r,s\right)$ such that $ab-cd \geq 2$ .

28 replies

who

Jul 8, 2006

asdf334

2 hours ago

H not needed

dchenmathcounts 44

N 2 hours ago by Ilikeminecraft

Source: USEMO 2019/1

Let $ABCD$ be a cyclic quadrilateral. A circle centered at $O$ passes through $B$ and $D$ and meets lines $BA$ and $BC$ again at points $E$ and $F$ (distinct from $A,B,C$ ). Let $H$ denote the orthocenter of triangle $DEF.$ Prove that if lines $AC,$ $DO,$ $EF$ are concurrent, then triangle $ABC$ and $EHF$ are similar.

Robin Son

44 replies

dchenmathcounts

May 23, 2020

Ilikeminecraft

2 hours ago

IZHO 2017 Functional equations

user01 51

N 3 hours ago by lksb

Source: IZHO 2017 Day 1 Problem 2

Find all functions $f:R \rightarrow R$ such that $(x+y^2)f(yf(x))=xyf(y^2+f(x))$ , where $x,y \in \mathbb{R}$

51 replies

user01

Jan 14, 2017

lksb

3 hours ago

chat gpt

fuv870 2

N 3 hours ago by fuv870

The chat gpt alreadly knows how to solve the problem of IMO USAMO and AMC?

2 replies

1 viewing

fuv870

3 hours ago

fuv870

3 hours ago

Inequality with wx + xy + yz + zw = 1

Fermat -Euler 23

N 3 hours ago by hgomamogh

Source: IMO ShortList 1990, Problem 24 (THA 2)

Let $w, x, y, z$ are non-negative reals such that $wx + xy + yz + zw = 1$ .
Show that $\frac {w^3}{x + y + z} + \frac {x^3}{w + y + z} + \frac {y^3}{w + x + z} + \frac {z^3}{w + x + y}\geq \frac {1}{3}$ .

23 replies

Fermat -Euler

Nov 2, 2005

hgomamogh

3 hours ago

Waiting for a dm saying me again "old geometry"

drmzjoseph 0

3 hours ago

Source: Idk easy

Given $ABCD$ a tangencial quadrilateral that is not a rhombus, let $a,b,c,d$ be lengths of tangents from $A,B,C,D$ to the incircle of the quadrilateral which center is $I$ . Let $M,N$ be the midpoints of $AC,BD$ resp. Prove that
$\frac{MI}{IN}=\frac{a+c}{b+d}$

0 replies

drmzjoseph

3 hours ago

0 replies

Finally hard NT on UKR MO from NT master

mshtand1 2

N 3 hours ago by IAmTheHazard

Source: Ukrainian Mathematical Olympiad 2025. Day 1, Problem 11.4

A pair of positive integer numbers $(a, b)$ is given. It turns out that for every positive integer number $n$ , for which the numbers $(n - a)(n + b)$ and $n^2 - ab$ are positive, they have the same number of divisors. Is it necessarily true that $a = b$ ?

Proposed by Oleksii Masalitin

2 replies

mshtand1

Mar 13, 2025

IAmTheHazard

3 hours ago

IMOC 2017 G5 (<A=120 => E, F, Y,Z are concyclic, incenter related)

parmenides51 4

N 3 hours ago by ehuseyinyigit

Source: https://artofproblemsolving.com/community/c6h1740077p11309077

We have $\vartriangle ABC$ with $I$ as its incenter. Let $D$ be the intersection of $AI$ and $BC$ and define $E, F$ in a similar way. Furthermore, let $Y = CI \cap DE, Z = BI \cap DF$ . Prove that if $\angle BAC = 120^o$ , then $E, F, Y,Z$ are concyclic.
IMAGE

4 replies

parmenides51

Mar 20, 2020

ehuseyinyigit

3 hours ago

2025 ROSS Program

G H J

Reveal topic tags

Ross Mathematics Program

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106 posts

#1 h Yesterday at 2:36 AM

Y by

Since the application has ended, are we now free to discuss the problems and stats? How do you think this year's problems are?

Z K Y

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1680 posts

#2 h Yesterday at 2:38 AM

Y by

Thought it was due tonight

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1465 posts

#3 h Yesterday at 2:55 AM

Y by

For problem 5 part (g), I got 1434. Can anyone confirm?

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106 posts

#4 h Yesterday at 3:03 AM

Y by

mathnerd_101 wrote:

For problem 5 part (g), I got 1434. Can anyone confirm?

???

I don't think there are 5 problems lol

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967 posts

#5 h Yesterday at 3:06 AM

Y by

scls140511 wrote:

mathnerd_101 wrote:

For problem 5 part (g), I got 1434. Can anyone confirm?

???

I don't think there are 5 problems lol

they're trolling lol

i don't know much about the ross program myself, but if what theta said was true, discussion should be held off for a few hours

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1465 posts

#7 h Yesterday at 3:16 AM • 1 Y

Y by aidan0626

scls140511 wrote:

I don't think there are 5 problems lol

There were 50 problems for qualified students. It was essentially a superbuffed version of the Problem Set that was sent out to talented individuals via email. All 50 problems had to be completed within a 348 minute interval, making it extremely challenging.

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1724 posts

akliu

#10 h Yesterday at 4:10 AM

Y by

mathnerd_101 wrote:

scls140511 wrote:

I don't think there are 5 problems lol

There were 50 problems for qualified students. It was essentially a superbuffed version of the Problem Set that was sent out to talented individuals via email. All 50 problems had to be completed within a 348 minute interval, making it extremely challenging.

Can confirm. In all seriousness, my recommender didn't fill out the recommendation letter before the due date, but I was still allowed to submit. Does anyone know the specific date that the recommender must fill the form by?

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403 posts

#11 h Yesterday at 10:13 AM

Y by

The application was due 12 am LOCAL time. Please be slightly patient before creating discus threads.

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576 posts

#12 h Yesterday at 3:55 PM

Y by

Was the problem set harder or easier than previous years?

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MathPerson12321

3618 posts

MathPerson12321

#13 h Yesterday at 3:58 PM

Y by

discussion is allowed now i think

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17018 posts

#14 h 5 hours ago

Y by

Since it said local time does that mean it’s fine if I submitted from a location where the time was 12:00 AM (but in my home location, it would’ve been 1:00 AM)?

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3302 posts

#15 h 4 hours ago • 3 Y

Y by KevinChen_Yay, Alex-131, sanaops9

by the way its Ross not ROSS

Ross doesn't stand for anything it's named after Arnold Ross the founder

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5294 posts

#16 h an hour ago

Y by

Submitted on Friday at 11:56 pm and then had CMIMC the next day

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27 posts

#17 h an hour ago

Y by

How do you guys find out about these contests?

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403 posts

#18 h 24 minutes ago

Y by

Bnn81351 wrote:

How do you guys find out about these contests?

CMIMC is pretty well known. The common ones are HMMT, PUMAC, CMIMC, BMT, SMT, etc.

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1724 posts

akliu

#19 h 20 minutes ago

Y by

Good news to anyone who didn't get a recommendation letter submitted before the actual application deadline! Your recommender has until the end of March 22 to submit it.

Attachments:

This post has been edited 1 time. Last edited by akliu, 19 minutes ago
Reason: typo

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