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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.

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[*]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
Coloring is hard
liekkas   3
N 3 minutes ago by sttsmet
Source: 2019 China TST Test 3 P6
Given positive integers $d \ge 3$, $r>2$ and $l$, with $2d \le l <rd$. Every vertice of the graph $G(V,E)$ is assigned to a positive integer in $\{1,2,\cdots,l\}$, such that for any two consecutive vertices in the graph, the integers they are assigned to, respectively, have difference no less than $d$, and no more than $l-d$.
A proper coloring of the graph is a coloring of the vertices, such that any two consecutive vertices are not the same color. It's given that there exist a proper subset $A$ of $V$, such that for $G$'s any proper coloring with $r-1$ colors, and for an arbitrary color $C$, either all numbers in color $C$ appear in $A$, or none of the numbers in color $C$ appear in $A$.
Show that $G$ has a proper coloring within $r-1$ colors.
3 replies
liekkas
Mar 29, 2019
sttsmet
3 minutes ago
thanks u!
Ruji2018252   0
15 minutes ago
Find all functions $f: \mathbb{R}\to \mathbb{R},f$ that are continuous on $\mathbb{R}$ satisfying
$$f(x+9f(y))=4y+f(x), \forall x,y \in \mathbb{R}$$
0 replies
Ruji2018252
15 minutes ago
0 replies
Hard Number Theory Problem
ZeltaQN2008   3
N 21 minutes ago by ZeltaQN2008
Source: VIMONI Test 2025
Let $n$ be a positive integer. Define $N_1$ as the number of integer pairs $(x,y)$ satisfying $x^{2}+3y^{2}=8n+4$ with $x$ odd. Define $N_2$ as the number of integer pairs $(x,y)$ satisfying $x^{2}+3y^{2}=8n+4.$
Prove that $N_{1}= \frac23\,N_{2}.$

3 replies
ZeltaQN2008
2 hours ago
ZeltaQN2008
21 minutes ago
Monic Polynomial
IstekOlympiadTeam   23
N 26 minutes ago by blueprimes
Source: Romanian Masters 2017 D1 P2
Determine all positive integers $n$ satisfying the following condition: for every monic polynomial $P$ of degree at most $n$ with integer coefficients, there exists a positive integer $k\le n$ and $k+1$ distinct integers $x_1,x_2,\cdots ,x_{k+1}$ such that \[P(x_1)+P(x_2)+\cdots +P(x_k)=P(x_{k+1})\].

Note. A polynomial is monic if the coefficient of the highest power is one.
23 replies
IstekOlympiadTeam
Feb 25, 2017
blueprimes
26 minutes ago
Inequalities
sqing   3
N 3 hours ago by sqing
Let $ a,b>0   $ . Prove that
$$ \frac{a}{a^2+a +2b+1}+ \frac{b}{b^2+2a +b+1}  \leq  \frac{2}{5} $$$$ \frac{a}{a^2+2a +b+1}+ \frac{b}{b^2+a +2b+1}  \leq  \frac{2}{5} $$
3 replies
sqing
May 13, 2025
sqing
3 hours ago
Pertenacious Polynomial Problem
BadAtCompetitionMath21420   5
N 3 hours ago by BadAtCompetitionMath21420
Let the polynomial $P(x) = x^3-x^2+px-q$ have real roots and real coefficients with $q>0$. What is the maximum value of $p+q$?

This is a problem I made for my math competition, and I wanted to see if someone would double-check my work (No Mike allowed):

solution
Is this solution good?
5 replies
BadAtCompetitionMath21420
Yesterday at 3:13 AM
BadAtCompetitionMath21420
3 hours ago
Max and min of ab+bc+ca-abc
Tiira   5
N 4 hours ago by sqing
a, b and c are three non-negative reel numbers such that a+b+c=1.
What are the extremums of
ab+bc+ca-abc
?
5 replies
Tiira
Jan 29, 2021
sqing
4 hours ago
Inequalities
sqing   12
N 4 hours ago by sqing
Let $a,b,c >2 $ and $ ab+bc+ca \leq 75.$ Show that
$$\frac{1}{a-2}+\frac{1}{b-2}+\frac{1}{c-2}\geq 1$$Let $a,b,c >2 $ and $ \frac{1}{a}+\frac{1}{b}+\frac{1}{c}\geq \frac{6}{7}.$ Show that
$$\frac{1}{a-2}+\frac{1}{b-2}+\frac{1}{c-2}\geq 2$$
12 replies
sqing
May 13, 2025
sqing
4 hours ago
2017 DMI Individual Round - Downtown Mathematics Invitational
parmenides51   14
N 5 hours ago by SomeonecoolLovesMaths
p1. Compute the smallest positive integer $x$ such that $351x$ is a perfect cube.


p2. A four digit integer is chosen at random. What is the probability all $4$ digits are distinct?


p3. If $$\frac{\sqrt{x + 1}}{\sqrt{x}}+ \frac{\sqrt{x}}{\sqrt{x + 1}} =\frac52.$$Solve for $x$.


p4. In $\vartriangle ABC$, $AB = 13$, $BC = 14$, and $AC = 15$. Let $D$ be the point on $BC$ such that $AD \perp BC$, and let $E$ be the midpoint of $AD$. If $F$ is a point such that $CDEF$ is a rectangle, compute the area of $\vartriangle AEF$.


p5. Square $ABCD$ has a sidelength of $4$. Points $P$, $Q$, $R$, and $S$ are chosen on $AB$, $BC$, $CD$, and $AD$ respectively, such that $AP$, $BQ$, $CR$, and $DS$ are length $1$. Compute the area of quadrilateral $P QRS$.


p6. A sequence $a_n$ satisfies for all integers $n$, $$a_{n+1} = 3a_n - 2a_{n-1}.$$If $a_0 = -30$ and $a_1 = -29$, compute $a_{11}$.


p7. In a class, every child has either red hair, blond hair, or black hair. All but $20$ children have black hair, all but $17$ have red hair, and all but $5$ have blond hair. How many children are there in the class?


p8. An Akash set is a set of integers that does not contain two integers such that one divides the other. Compute the minimum positive integer $n$ such that the set $\{1, 2, 3, ..., 2017\}$ can be partitioned into n Akash subsets.


PS. You should use hide for answers. Collected here.
14 replies
parmenides51
Oct 2, 2023
SomeonecoolLovesMaths
5 hours ago
p+2^p-3=n^2
tom-nowy   0
5 hours ago
Let $n$ be a natural number and $p$ be a prime number. How many different pairs $(n, p)$ satisfy the equation:
$$p + 2^p - 3 = n^2 .$$
Inspired by https://artofproblemsolving.com/community/c4h3560823
0 replies
tom-nowy
5 hours ago
0 replies
Range of a function
Pscgylotti   1
N Today at 9:24 AM by Mathzeus1024
Try to get the range of function $f(x)=cosx+\sqrt{cos^{2}x-4\sqrt{2}cosx+4sinx+9}$ :
1 reply
Pscgylotti
Jul 22, 2019
Mathzeus1024
Today at 9:24 AM
Inequalities
sqing   17
N Today at 9:05 AM by sqing
Let $ a,b,c>0 , a+b+c +abc=4$. Prove that
$$ \frac {a}{a^2+2}+\frac {b}{b^2+2}+\frac {c}{c^2+2} \leq 1$$Let $ a,b,c>0 , ab+bc+ca+abc=4$. Prove that
$$ \frac {a}{a^2+2}+\frac {b}{b^2+2}+\frac {c}{c^2+2} \leq 1$$
17 replies
sqing
May 15, 2025
sqing
Today at 9:05 AM
Calculate the function
Arkham   1
N Today at 9:03 AM by Mathzeus1024
Consider $ y = f (x) = \arcsin (- \sqrt {1 + 10x}) $, $ x \in [-1 / 10,0] $. Calculate the function where $ g $ is the inverse function of $ f $

Note: $ g (y) = f ^ {- 1} (y) $]
1 reply
Arkham
Apr 29, 2021
Mathzeus1024
Today at 9:03 AM
Incircle concurrency
niwobin   3
N Today at 8:37 AM by sunken rock
Triangle ABC with incenter I, incircle is tangent to BC, AC, and AB at D, E and F respectively.
DT is a diameter for the incircle, and AT meets the incircle again at point H.
Let DH and EF intersect at point J. Prove: AJ//BC.
3 replies
niwobin
May 11, 2025
sunken rock
Today at 8:37 AM
Using search function
pco   11
N Oct 1, 2022 by Moubinool
I often request that posters use the search function before posting a [not so] new problem (look at the little magnifying glass symbol just at the right of the forum name on the top of forum window, or also here).

Why ?

I received in PM some remarks about the fact that search function seems very often to give tons of results without any link with the searched problem. Here are some tips I frequently use :

1) use quotes for strings : search "P(x^2-1)" instead of P(x^2-1)

2) dont hesitate to use the character "+" which means "mandatory"

3) Split long strings in order to find problems where strings are not in the same order :
Instead of +"f(2x+f(y))=f(2x)+f(f(y))+xf(2y)", prefer +"f(2x+f(y))" +"f(2x)" +"f(f(y))" +"xf(2y)"
So you'll find $f(2x+f(y))=f(2x)+f(f(y))+xf(2y)+f(f(y))$

4) If the problem you are looking for contains strings as "2015" or "2016", try to exclude these strings from search term since this is likely an "annual problem" and it may have been posted wu=ith older years?
For example +"f(x-f(y)" +"f(x+y^" +"f(f(y)+y^" will find $f(x+f(y))=f(x+y^{2016})+f(f(y)+y^{2016})$ as well as $f(x+f(y))=f(x+y^{2002})+f(f(y)+y^{2002})$

5) if the problem you are looking for uses function $g(x)$ or $h(x)$, dont hesitate to search also for function name $f(x)$ which is generally the name of the "unknown" function in a FE problem.

6) Dont hesitate also to search for similar problem, just swapping variables $x,y$ (for example search also for FE "$f(1+xf(y))=yf(x+y)$" when you want to solve "$f(1+yf(x))=xf(x+y)$")

For example :
Searching for problem $P(x^2-1)=P(x)P(-x)$ :
+"P(x^2-1)" +"P(-x)"
(I avoid using +"P(x)P(-x)" which would miss $P(-x)P(x)$ or $P(x).P(-x)$)

Searching for problem $f(x+yf(x))=f(f(x))+f(y)$ :
+"f(x+yf(x))" +"f(f(x))"
(I avoid including the +f(y) in the second item in order to find both f(y)+f(f(x)) and f(f(x))+f(y))

Searching for problem $g(x+y)+g(x)g(y)=g(xy)+g(x)+g(y)$ :
+"f(x+y)+f(x)f(y)" +"f(xy)+f(x)+f(y)"
(I prefered using $f()$ instead of $g())
11 replies
pco
Oct 28, 2016
Moubinool
Oct 1, 2022
Using search function
G H J
G H BBookmark kLocked kLocked NReply
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pco
23515 posts
#1 • 126 Y
Y by Derive_Foiler, Tintarn, lmht, rafayaashary1, nicky-glass, sansae, 62861, bobthesmartypants, bel.jad5, talkon, yassinelbk007, Python54, shinichiman, rkm0959, randomusername, Ankoganit, fattypiggy123, Med_Sqrt, pi_Plus_45x23, adityaguharoy, Filipjack, lminsl, artsolver, TheOneYouWant, Ghoshadi, Akatsuki1010, Lsway, Churent, v_Enhance, muradmurad, Gluncho, ydr202020, sheripqr, TomMarvoloRiddle, equinox145111, Vimath, Snakes, Shaddoll1234, Wizard_32, QWERTYphysics, AnArtist, saiii456, Supercali, Amir Hossein, gmail.com, MNJ2357, lkarhat, enthusiast101, NiltonCesar, opptoinfinity, AlastorMoody, harry1234, mathisreal, Centralorbit, Jerry37284, MathPassionForever, Pluto1708, Plasma_Vortex, BEHZOD_UZ, Durga01, Aryan-23, amar_04, Feridimo, AmirKhusrau, Mathmick51, OliverA, Antara_Dey_temporaryacc, Abidabi, p_square, Bumblebee60, FatherOfIngenuity, aa1024, Kar-98k, IAmTheHazard, fjm30, Fedor Petrov, AFSA, Aritra12, test20, matinyousefi, hsiangshen, TheBarioBario, iman007, lneis1, mathingbingo, Kanep, Functional_equation, arqady, Supernova283, GCA, teomihai, Pluto04, animath_314159, OlympusHero, tenebrine, ZHEKSHEN, mango5, megarnie, tigerzhang, Darkztar, EmilXM, RubixMaster21, centslordm, mrdriller, rayfish, laikhanhhoang_3011, pi_quadrat_sechstel, JUSTemom, qwertyboyfromalotoftime, myh2910, ghu2024, Quidditch, CyclicISLscelesTrapezoid, David-Vieta, IMUKAT, thedodecagon, Seungjun_Lee, math_comb01, cos111, FreDER, Adventure10, Fatemeh06, Mango247, Tellocan, Arslan, ehuseyinyigit
I often request that posters use the search function before posting a [not so] new problem (look at the little magnifying glass symbol just at the right of the forum name on the top of forum window, or also here).

Why ?

I received in PM some remarks about the fact that search function seems very often to give tons of results without any link with the searched problem. Here are some tips I frequently use :

1) use quotes for strings : search "P(x^2-1)" instead of P(x^2-1)

2) dont hesitate to use the character "+" which means "mandatory"

3) Split long strings in order to find problems where strings are not in the same order :
Instead of +"f(2x+f(y))=f(2x)+f(f(y))+xf(2y)", prefer +"f(2x+f(y))" +"f(2x)" +"f(f(y))" +"xf(2y)"
So you'll find $f(2x+f(y))=f(2x)+f(f(y))+xf(2y)+f(f(y))$

4) If the problem you are looking for contains strings as "2015" or "2016", try to exclude these strings from search term since this is likely an "annual problem" and it may have been posted wu=ith older years?
For example +"f(x-f(y)" +"f(x+y^" +"f(f(y)+y^" will find $f(x+f(y))=f(x+y^{2016})+f(f(y)+y^{2016})$ as well as $f(x+f(y))=f(x+y^{2002})+f(f(y)+y^{2002})$

5) if the problem you are looking for uses function $g(x)$ or $h(x)$, dont hesitate to search also for function name $f(x)$ which is generally the name of the "unknown" function in a FE problem.

6) Dont hesitate also to search for similar problem, just swapping variables $x,y$ (for example search also for FE "$f(1+xf(y))=yf(x+y)$" when you want to solve "$f(1+yf(x))=xf(x+y)$")

For example :
Searching for problem $P(x^2-1)=P(x)P(-x)$ :
+"P(x^2-1)" +"P(-x)"
(I avoid using +"P(x)P(-x)" which would miss $P(-x)P(x)$ or $P(x).P(-x)$)

Searching for problem $f(x+yf(x))=f(f(x))+f(y)$ :
+"f(x+yf(x))" +"f(f(x))"
(I avoid including the +f(y) in the second item in order to find both f(y)+f(f(x)) and f(f(x))+f(y))

Searching for problem $g(x+y)+g(x)g(y)=g(xy)+g(x)+g(y)$ :
+"f(x+y)+f(x)f(y)" +"f(xy)+f(x)+f(y)"
(I prefered using $f()$ instead of $g())
This post has been edited 7 times. Last edited by pco, Jan 26, 2021, 9:36 AM
Reason: Added tip 6
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Skravin
763 posts
#2 • 2 Y
Y by Adventure10, Mango247
must had been irritated by n(I'd not mention actual nick) guy
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lmht
147 posts
#3 • 7 Y
Y by Tanb, gmail.com, karitoshi, amar_04, OliverA, Adventure10, Mango247
How to search about geometry ? :-D
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pco
23515 posts
#6 • 3 Y
Y by mathisreal, Adventure10, Mango247
Added tip 4
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AlastorMoody
2125 posts
#8 • 5 Y
Y by NiltonCesar, amar_04, AmirKhusrau, OliverA, Adventure10
Seriously....can someone tell how to search for a geometry problem....or geometry problems having sort of same configuration??
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AmirKhusrau
230 posts
#9 • 1 Y
Y by Mango247
AlastorMoody wrote:
Seriously....can someone tell how to search for a geometry problem....or geometry problems having sort of same configuration??

Anyone???
Z K Y
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pco
23515 posts
#10 • 2 Y
Y by Mango247, Mango247
Added tip 5
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pco
23515 posts
#12
Y by
Added tip 6
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Aopamy
1562 posts
#13
Y by
uhhh... how to search for geometry problems effectively?
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oVlad
1746 posts
#14
Y by
Thanks for the tips!
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Facejo
2849 posts
#15 • 2 Y
Y by EmilXM, MetaphysicalWukong
This should be an announcement tbh
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Moubinool
5569 posts
#16
Y by
pco thanks
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N Quick Reply
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