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k a April Highlights and 2025 AoPS Online Class Information
jlacosta   0
Apr 2, 2025
Spring is in full swing and summer is right around the corner, what are your plans? At AoPS Online our schedule has new classes starting now through July, so be sure to keep your skills sharp and be prepared for the Fall school year! Check out the schedule of upcoming classes below.

WOOT early bird pricing is in effect, don’t miss out! If you took MathWOOT Level 2 last year, no worries, it is all new problems this year! Our Worldwide Online Olympiad Training program is for high school level competitors. AoPS designed these courses to help our top students get the deep focus they need to succeed in their specific competition goals. Check out the details at this link for all our WOOT programs in math, computer science, chemistry, and physics.

Looking for summer camps in math and language arts? Be sure to check out the video-based summer camps offered at the Virtual Campus that are 2- to 4-weeks in duration. 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 events:
[list][*]April 3rd (Webinar), 4pm PT/7:00pm ET, Learning with AoPS: Perspectives from a Parent, Math Camp Instructor, and University Professor
[*]April 8th (Math Jam), 4:30pm PT/7:30pm ET, 2025 MATHCOUNTS State Discussion
April 9th (Webinar), 4:00pm PT/7:00pm ET, Learn about Video-based Summer Camps at the Virtual Campus
[*]April 10th (Math Jam), 4:30pm PT/7:30pm ET, 2025 MathILy and MathILy-Er Math Jam: Multibackwards Numbers
[*]April 22nd (Webinar), 4:00pm PT/7:00pm ET, Competitive Programming at AoPS (USACO).[/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
Apr 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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Inspired by JK1603JK
sqing   0
18 minutes ago
Source: Own
Let $ a,b,c $ be reals such that $ abc\neq 0$ and $ a+b+c=0. $ Prove that
$$\left|\frac{a-b}{c}\right|+k\left|\frac{b-c}{a} \right|+k^2\left|\frac{c-a}{b} \right|\ge 3(k+1)$$Where $ k>0.$
$$\left|\frac{a-b}{c}\right|+2\left|\frac{b-c}{a} \right|+4\left|\frac{c-a}{b} \right|\ge 9$$
0 replies
sqing
18 minutes ago
0 replies
J
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problem interesting
Cobedangiu   9
N 21 minutes ago by Cobedangiu
Let $a=3k^2+3k+1 (a,k \in N)$
$i)$ Prove that: $a^2$ is the sum of $3$ square numbers
$ii)$ Let $b \vdots a$ and $b$ is the sum of $3$ square numbers. Prove that: $b^n$ is the sum of $3$ square numbers
9 replies
Cobedangiu
Yesterday at 5:06 AM
Cobedangiu
21 minutes ago
J
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4-var inequality
RainbowNeos   0
31 minutes ago
Given $a,b,c,d>0$, show that
\[\frac{a}{b}+\frac{b}{c}+\frac{c}{d}+\frac{d}{a}\geq 4+\frac{8(a-c)^2}{(a+b+c+d)^2}.\]
0 replies
1 viewing
RainbowNeos
31 minutes ago
0 replies
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Find all integer pairs (m,n) such that 2^n! + 1 | 2^m! + 19
Goblik   0
an hour ago
Find all positive integer pairs $(m,n)$ such that $2^{n!} + 1 | 2^{m!} + 19$
0 replies
+1 w
Goblik
an hour ago
0 replies
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Junior Balkan Mathematical Olympiad 2024- P3
Lukaluce   15
N an hour ago by MATHS_ENTUSIAST
Source: JBMO 2024
Find all triples of positive integers $(x, y, z)$ that satisfy the equation

$$2020^x + 2^y = 2024^z.$$
Proposed by Ognjen Tešić, Serbia
15 replies
Lukaluce
Jun 27, 2024
MATHS_ENTUSIAST
an hour ago
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AD is Euler line of triangle IKL
VicKmath7   16
N an hour ago by ErTeeEs06
Source: IGO 2021 Advanced P5
Given a triangle $ABC$ with incenter $I$. The incircle of triangle $ABC$ is tangent to $BC$ at $D$. Let $P$ and $Q$ be points on the side BC such that $\angle PAB = \angle BCA$ and $\angle QAC = \angle ABC$, respectively. Let $K$ and $L$ be the incenter of triangles $ABP$ and $ACQ$, respectively. Prove that $AD$ is the Euler line of triangle $IKL$.

Proposed by Le Viet An, Vietnam
16 replies
VicKmath7
Dec 30, 2021
ErTeeEs06
an hour ago
J
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Twin Prime Diophantine
awesomeming327.   22
N an hour ago by MATHS_ENTUSIAST
Source: CMO 2025
Determine all positive integers $a$, $b$, $c$, $p$, where $p$ and $p+2$ are odd primes and
\[2^ap^b=(p+2)^c-1.\]
22 replies
awesomeming327.
Mar 7, 2025
MATHS_ENTUSIAST
an hour ago
J
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Inequality with 3 variables and a special condition
Nuran2010   3
N an hour ago by sqing
Source: Azerbaijan Al-Khwarizmi IJMO TST 2024
For positive real numbers $a,b,c$ we have $3abc \geq ab+bc+ca$.
Prove that:

$\frac{1}{a^3+b^3+c}+\frac{1}{b^3+c^3+a}+\frac{1}{c^3+a^3+b} \leq \frac{3}{a+b+c}$.

Determine the equality case.
3 replies
Nuran2010
Tuesday at 5:06 PM
sqing
an hour ago
J
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Inspired by JK1603JK and arqady
sqing   1
N 2 hours ago by sqing
Source: Own
Let $ a,b,c $ be reals such that $ abc\neq 0$ and $ a+b+c=0. $ Prove that
$$\left|\frac{a-2b}{c}\right|+\left|\frac{b-2c}{a} \right|+\left|\frac{c-2a}{b} \right|\ge \frac{1+3\sqrt{13+16\sqrt{2}}}{2}$$$$\left|\frac{a-3b}{c}\right|+\left|\frac{b-3c}{a}\right|+\left|\frac{c-3a}{b}\right|\ge 1+2\sqrt{13+16\sqrt{2}} $$
1 reply
sqing
2 hours ago
sqing
2 hours ago
J
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Website to learn math
hawa   72
N 2 hours ago by KF329
Hi, I'm kinda curious what website do yall use to learn math, like i dont find any website thats fun to learn math
72 replies
hawa
Apr 9, 2025
KF329
2 hours ago
J
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An easiest problem ever
Asilbek777   0
2 hours ago
Simplify
0 replies
Asilbek777
2 hours ago
0 replies
J
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Berkeley mini Math Tournament Online is June 7
BerkeleyMathTournament   0
2 hours ago
Berkeley mini Math Tournament is a math competition hosted for middle school students once a year. Students compete in multiple rounds: individual round, team round, puzzle round, and relay round.

BmMT 2025 Online will be held on June 7th, and registration is OPEN! Registration is $8 per student. Our website https://berkeley.mt/events/bmmt-2025-online/ has more details about the event, past tests to practice with, and frequently asked questions. We look forward to building community and inspiring students as they explore the world of math!

3 out of 4 of the rounds are completed with a team, so it’s a great opportunity for students to work together. Beyond getting more comfortable with math and becoming better problem solvers, our team is preparing some fun post-competition activities!

Registration is open to students in grades 8 or below. You do not have to be local to the Bay Area or California to register for BmMT Online. Students may register as a team of 1, but it is beneficial to compete on a team of at least 3 due to our scoring guideline and for the experience.

We hope you consider attending, or if you are a parent or teacher, that you encourage your students to think about attending BmMT. Thank you, and once again find more details/register at our website,https://berkeley.mt.
0 replies
BerkeleyMathTournament
2 hours ago
0 replies
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Summer Classes
triggod   0
5 hours ago
Summer STEM Success Series with Fikky Dosunmu!
Empower Your Learning. Sharpen Your Skills. Crush Your Goals.

Who Am I?
Hi! I’m Fikky Dosunmu, an incoming freshman at Carnegie Mellon University’s School of Computer Science, and was admitted to several other top institutions, including the California Institute of Technology.
This Summer’s Course Offerings (8–10 Weeks)

SAT Math Mastery
From Algebra to Advanced Word Problems — Learn test-taking strategies, avoid common traps, and aim for a perfect math score.
USACO Bronze Bootcamp
Jump into competitive programming! Master problem types in C++/Java, develop algorithmic thinking, and prep for Silver-level promotion.
Single Variable Calculus
Tackle limits, derivatives, integrals, and real-world applications with guided instruction tailored to AP/college-level rigor.

Why Learn with Me?
Selected Finalist – CMU’s prestigious Summer Academy for Math and Science (SAMS)
Run a YouTube channel with 70K+ views and 700+ subscribers, where I teach math and coding to students around the world with clarity and passion
1st Place – HPE CodeWars Advanced 2025
Solved over 500 competitive programming problems on platforms like Codeforces and USACO
Years of Science Bowl and Science Olympiad Experience
AP Scholar with 5s in AP Calculus BC, Computer Science A, Statistics, Physics, Chemistry, Psychology
Scored 800 on the SAT Math section (Perfect Score)
Hands-on coding and teaching experience through projects, contests, and club leadership



Format
Each course runs for 8 to 10 weeks, tailored to student pacing.
Classes held online via Zoom or Google Meet — flexible scheduling.
Price ranges from 160 to 200 (USD) per course (based on duration & customization).
First 2 classes are FREE — no commitment required!
Money-back guarantee if you’re not satisfied after the second class.
If you are interested in class, shoot me an email (specify which class) at nucleusdosunmu96@gmail.com
0 replies
triggod
5 hours ago
0 replies
J
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random achievements
Bummer12345   25
N 5 hours ago by A7456321
What are some random math achievements that you have accomplished but possess no real meaning?

For example, I solved #10 on the 2024 national mathcounts team round, though my team got a 5 Click to reveal hidden text and ended up getting 30-somethingth place
25 replies
Bummer12345
Mar 25, 2025
A7456321
5 hours ago
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J
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2025 MATHCOUNTS NATIONAL HUB
mathkiddus   15
N Apr 2, 2025 by GarudS
go to the official one
15 replies
mathkiddus
Apr 1, 2025
GarudS
Apr 2, 2025
J
2025 MATHCOUNTS NATIONAL HUB
G H J
Reveal topic tags
MATHCOUNTS
L
G H BBookmark kLocked kLocked NReply
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mathkiddus
232 posts
mathkiddus
#1 h  Apr 1, 2025, 3:24 PM
Y by
go to the official one
This post has been edited 4 times. Last edited by mathkiddus, Apr 3, 2025, 4:43 AM
Reason: delete topic pls mods
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pl246631
16 posts
pl246631
#2 h  Apr 1, 2025, 3:25 PM
Y by
FL was 42 41 40 39 38 37 37 for top 7
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iwastedmyusername
124 posts
iwastedmyusername
#3 h  Apr 1, 2025, 3:26 PM
Y by
lil bro theres already one of these
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DhruvJha
845 posts
DhruvJha
#4 h  Apr 1, 2025, 3:28 PM
Y by
mathkiddus wrote:
Previous Years' ``Hubs":(2022) (2023) (2024) Please Read
Now that it's April and we can discuss mathcounts state...
  • NJ: 43 (45 44 44 43 39 42 40 40 39 38) *
  • CA: 43 (45 44 43 43 43 42)
  • TX: 42 (43 43 43 42 42 40)
  • NY: 42 (43 42 42 42 41 40)
  • WA: 41 (42 45 41 41 41 41 41 41 41 40) *
  • MA: 41 (45 43 42 41 38 37 37)
  • NC: 39 (42 42 41 39 38 37 36/37)
  • IN: 39 (41 40 40 39)
  • OH: 37? (41? 40? 38? 37?) *
  • DE: 30 (34 33 32 30)
  • CT: ?? (44 40/41 ?? ??)
  • PA: ?? (41 ?? ?? ??) *
  • UT: ?? (42 ?? ?? ??) *
  • AR: ?? (45/46 ?? ?? ??)
  • AL: ?? (?? ?? ?? ??)
  • AK: ?? (?? ?? ?? ??)
  • AZ: ?? (?? ?? ?? ??)
  • CO: ?? (?? ?? ?? ??)
  • FL: ?? (?? ?? ?? ??)
  • GA: ?? (?? ?? ?? ??)
  • HI: ?? (?? ?? ?? ??)
  • ID: ?? (?? ?? ?? ??)
  • IL: ?? (?? ?? ?? ??)
  • IA: ?? (?? ?? ?? ??)
  • KS: ?? (?? ?? ?? ??)
  • KY: ?? (?? ?? ?? ??)
  • LA: ?? (?? ?? ?? ??)
  • ME: ?? (?? ?? ?? ??)
  • MD: ?? (?? ?? ?? ??)
  • MI: ?? (?? ?? ?? ??)
  • MN: ?? (?? ?? ?? ??)
  • MS: ?? (?? ?? ?? ??)
  • MO: ?? (?? ?? ?? ??)
  • MT: ?? (?? ?? ?? ??)
  • NE: ?? (?? ?? ?? ??)
  • NV: ?? (?? ?? ?? ??)
  • NH: ?? (?? ?? ?? ??)
  • NM: ?? (?? ?? ?? ??)
  • ND: ?? (?? ?? ?? ??)
  • OK: ?? (?? ?? ?? ??)
  • OR: ?? (?? ?? ?? ??)
  • RI: ?? (?? ?? ?? ??)
  • SC: ?? (?? ?? ?? ??)
  • SD: ?? (?? ?? ?? ??)
  • TN: ?? (?? ?? ?? ??)
  • VT: ?? (?? ?? ?? ??)
  • VA: ?? (?? ?? ?? ??)
  • WV: ?? (?? ?? ?? ??)
  • WI: ?? (?? ?? ?? ??)
  • WY: ?? (?? ?? ?? ??)
  • PR: ?? (?? ?? ?? ??)
  • VI: ?? (?? ?? ?? ??)
  • DD: ?? (?? ?? ?? ??)
  • SS: ?? (?? ?? ?? ??)
  • GU: ?? (?? ?? ?? ??)
  • DC: ?? (?? ?? ?? ??)
Please help me fill in any missing details or correct any incorrect details. Note: any row with an * at the end means countdown is official in that state, to explain why some lower scores are ahead of higher ones.
The reason why there are no tiers and the chart is a lot less colorful than last year is because
peace09 wrote:
learn from my mistakes

Bro NJ Is cracked #texas falloff?
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martianrunner
190 posts
martianrunner
#5 h  Apr 1, 2025, 3:32 PM
Y by
https://artofproblemsolving.com/community/c3h3539667_2025_mathcounts_state_hub

one of these was already made bro :sob:
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mathkiddus
232 posts
mathkiddus
#6 h  Apr 1, 2025, 3:38 PM
Y by
martianrunner wrote:
https://artofproblemsolving.com/community/c3h3539667_2025_mathcounts_state_hub

one of these was already made bro :sob:

Oh, :skull: there was some confusion in the nats server :skull: he was supposed to use this template
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BossLu99
1382 posts
BossLu99
#7 h  Apr 1, 2025, 6:10 PM
Y by
PA was 41 40 40 38
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giratina3
500 posts
giratina3
#8 h  Apr 2, 2025, 1:45 AM
Y by
There is already a thread for this. Scroll to the top of MSM posts.
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studylove
15 posts
studylove
#9 h  Apr 2, 2025, 7:12 PM
Y by
What was the answer to the subset question, target p6
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sanaops9
823 posts
sanaops9
#11 h  Apr 2, 2025, 7:15 PM
Y by
2024 i believe @above
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StrawberriBunni
13 posts
StrawberriBunni
#12 h  Apr 2, 2025, 7:18 PM
Y by
How do you do that question
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Eddie_tiger
341 posts
Eddie_tiger
#13 h  Apr 2, 2025, 9:46 PM
Y by
You needed to realize the answer was just an Arithmetic-geometric series and you needed to find the sum of the total terms.
This post has been edited 1 time. Last edited by Eddie_tiger, Apr 2, 2025, 9:46 PM
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MC_ADe
181 posts
MC_ADe
#14 h  Apr 2, 2025, 10:07 PM
Y by
It says not to discuss the questions currently, but if it is allowed I can post a solution.
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martianrunner
190 posts
martianrunner
#15 h  Apr 2, 2025, 10:26 PM
Y by
it's almost definitely allowed, a ton of people were talking about it
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EaZ_Shadow
1259 posts
EaZ_Shadow
#16 h  Apr 2, 2025, 10:36 PM
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studylove wrote:
What was the answer to the subset question, target p6

Arithmetico geometric series, and derive the formula
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GarudS
941 posts
GarudS
#17 h  Apr 2, 2025, 10:42 PM
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OR: 44 Sophia H. (41?) Kevin L. (38/26+16) Garud S. (38/24+14) Ryan Z.
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