Question

Number of bijections for $S_n$ with conditions

score 41 · Answer 1 · 2018-05-28 09:46:52

41

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Number of bijections for $S_n$ with conditions

Published on 28 May 2018 - 9:46

score 147 · Answer 2 · 2026-04-12 18:59:23

147

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Is the value of $\sum\limits_{k=1}^∞\frac1{(C_k)^n}$ known?

Published on 12 Apr 2026 - 18:59

score 51 · Answer 3 · 2026-04-12 03:13:20

51

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Amount of permutations with condition

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score 94 · Answer 4 · 2026-04-06 18:22:47

94

Views

Prove $1+2+2^2+\dots+2^{n-1}=2^n-1$

Published on 06 Apr 2026 - 18:22

score 4.9k · Answer 5 · 2026-03-29 13:23:25

4.9k

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Number of permutations without leading zeroes.

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score 54 · Answer 6 · 2026-04-13 12:07:52

54

Views

Find the distribution of Y given by the number of balls received by the first urn

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score 56 · Answer 7 · 2026-04-12 21:50:31

56

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$\mid A \cap B \mid = 1$, combinatoric

Published on 12 Apr 2026 - 21:50

score 162 · Answer 8 · 2026-03-25 07:21:57

162

Views

Prove that for a family of $100n$ subsets of a $[n]$ such that each subset has size $m$, there exists two whose intersection is at least $m^2/10n$.

Published on 25 Mar 2026 - 7:21

score 347 · Answer 9 · 2026-04-13 01:37:05

347

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Counting pairs of multisets with prescribed discrepancy

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score 43 · Answer 10 · 2026-04-11 03:33:24

43

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How many orders can one display stamps

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score 35 · Answer 11 · 2026-04-10 20:27:38

35

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Finding particular value of joint CDF of discrete random vector

Published on 10 Apr 2026 - 20:27

score 238 · Answer 12 · 2026-04-09 03:14:46

238

Views

Number of ways to represent $100$ as a sum of $1, 5, 10, 25$

Published on 09 Apr 2026 - 3:14

score 111 · Answer 13 · 2026-04-11 12:09:51

111

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Help me with this Olympiad problem

Published on 11 Apr 2026 - 12:09

score 73 · Answer 14 · 2026-04-13 12:54:30

73

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Equivalence of valuated vectors in standard matroids

Published on 13 Apr 2026 - 12:54

score 1.6k · Answer 15 · 2026-04-13 13:00:43

1.6k

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Expectation of number of equal points in tennis game

Published on 13 Apr 2026 - 13:00

List Question

Number of bijections for $S_n$ with conditions

Is the value of $\sum\limits_{k=1}^∞\frac1{(C_k)^n}$ known?

Amount of permutations with condition

Prove $1+2+2^2+\dots+2^{n-1}=2^n-1$

Number of permutations without leading zeroes.

Find the distribution of Y given by the number of balls received by the first urn

$\mid A \cap B \mid = 1$, combinatoric

Prove that for a family of $100n$ subsets of a $[n]$ such that each subset has size $m$, there exists two whose intersection is at least $m^2/10n$.

Counting pairs of multisets with prescribed discrepancy

How many orders can one display stamps

Finding particular value of joint CDF of discrete random vector

Number of ways to represent $100$ as a sum of $1, 5, 10, 25$

Help me with this Olympiad problem

Equivalence of valuated vectors in standard matroids

Expectation of number of equal points in tennis game

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