Question

Solving an Olympiad functional equation $f(f(n))=f(f(n+2)+2)=n$

score 631 · Answer 1 · 2026-03-25 01:20:28

631

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Solving an Olympiad functional equation $f(f(n))=f(f(n+2)+2)=n$

Published on 25 Mar 2026 - 1:20

score 50 · Answer 2 · 2026-03-25 05:09:43

50

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Find the minimum value of the sum $KP+PQ+QH$

Published on 25 Mar 2026 - 5:09

score 102 · Answer 3 · 2026-03-24 23:40:54

102

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Functional equation with commutativity

Published on 24 Mar 2026 - 23:40

score 212 · Answer 4 · 2018-02-13 16:31:19

212

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Provig that the number $z_n$ of zero element of $A^{-1} $ satisfies $z_n\le n^2-2n$

Published on 13 Feb 2018 - 16:31

score 368 · Answer 5 · 2018-02-13 18:54:46

368

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How to solve the equation $x^2+2=4\sqrt{x^3+1}$?

Published on 13 Feb 2018 - 18:54

score 102 · Answer 6 · 2026-03-25 04:38:58

102

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Finding a function defined on the set of nonnegative integers satisfying a condition

Published on 25 Mar 2026 - 4:38

score 110 · Answer 7 · 2018-02-14 16:17:43

110

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Number of ways to arrange numbers in matrix in A.P.

Published on 14 Feb 2018 - 16:17

score 365 · Answer 8 · 2026-03-25 09:26:20

365

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Diophantine quadratic $(5m+3)(3m+1)=n^2$

Published on 25 Mar 2026 - 9:26

score 1.4k · Answer 9 · 2018-02-17 14:37:56

1.4k

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Probability of choosing two marbles of the same color?

Published on 17 Feb 2018 - 14:37

score 2.8k · Answer 10 · 2018-02-17 15:11:27

2.8k

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Number of ways to color the edges of a tetrahedron with two colors?

Published on 17 Feb 2018 - 15:11

score 235 · Answer 11 · 2026-03-25 08:01:50

235

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Christian is $3$ times as old as Marie. Marie is $12$ years younger - Is there a simple method for elementary school student?

Published on 25 Mar 2026 - 8:01

score 511 · Answer 12 · 2018-02-18 04:45:48

511

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Number of subsets with a median of 6?

Published on 18 Feb 2018 - 4:45

score 75 · Answer 13 · 2026-03-25 03:24:21

75

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A sequence+ divisibility proof contest math

Published on 25 Mar 2026 - 3:24

score 176 · Answer 14 · 2026-03-25 08:00:37

176

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Greg and Gary start a bicycle race at the same place and time - Need a simple method for elementary school student

Published on 25 Mar 2026 - 8:00

score 433 · Answer 15 · 2018-02-18 15:14:48

433

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Number of "swappy" numbers?

Published on 18 Feb 2018 - 15:14

List Question

Solving an Olympiad functional equation $f(f(n))=f(f(n+2)+2)=n$

Find the minimum value of the sum $KP+PQ+QH$

Functional equation with commutativity

Provig that the number $z_n$ of zero element of $A^{-1} $ satisfies $z_n\le n^2-2n$

How to solve the equation $x^2+2=4\sqrt{x^3+1}$?

Finding a function defined on the set of nonnegative integers satisfying a condition

Number of ways to arrange numbers in matrix in A.P.

Diophantine quadratic $(5m+3)(3m+1)=n^2$

Probability of choosing two marbles of the same color?

Number of ways to color the edges of a tetrahedron with two colors?

Christian is $3$ times as old as Marie. Marie is $12$ years younger - Is there a simple method for elementary school student?

Number of subsets with a median of 6?

A sequence+ divisibility proof contest math

Greg and Gary start a bicycle race at the same place and time - Need a simple method for elementary school student

Number of "swappy" numbers?

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