Question

Picking two cards of the same suit

score 22.5k · Answer 1 · 2018-04-15 20:02:26

22.5k

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Picking two cards of the same suit

Published on 15 Apr 2018 - 20:02

score 55 · Answer 2 · 2018-04-15 20:04:02

55

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What is the probability that each person ends up with EXACTLY one of the 3 spades when the cards are dealt?

Published on 15 Apr 2018 - 20:04

score 177 · Answer 3 · 2026-03-28 10:04:29

177

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Permutations: an even number of 5 digits not starting with 0

Published on 28 Mar 2026 - 10:04

score 67 · Answer 4 · 2026-03-25 13:04:59

67

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Proving that ${4a \choose 2a} - {2a \choose a}$ is divisible by 4

Published on 25 Mar 2026 - 13:04

score 2.6k · Answer 5 · 2018-04-15 22:31:42

2.6k

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What is the probability that a domino randomly selected from the set will be a double?

Published on 15 Apr 2018 - 22:31

score 144 · Answer 6 · 2026-04-04 10:09:40

144

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Solving a word problem using a generating function

Published on 04 Apr 2026 - 10:09

score 259 · Answer 7 · 2026-03-25 23:35:35

259

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The $n$-astrolabacus sequence.

Published on 25 Mar 2026 - 23:35

score 154 · Answer 8 · 2026-04-03 05:42:11

154

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What happens with subdivisions of normal fans in Sage?

Published on 03 Apr 2026 - 5:42

score 366 · Answer 9 · 2026-03-26 04:53:27

366

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How to use bijective proof to prove $S(n+1, m+1) = \sum\limits_{k=m}^n S(k, m) × \binom{n}{k}$

Published on 26 Mar 2026 - 4:53

score 66 · Answer 10 · 2018-04-16 12:39:17

66

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prove that $\sum_{k=0}^n \frac{1}{k+1}\binom{2k}{k}\binom{2n-2k}{n-k}=\binom{2n+1}{n}$

Published on 16 Apr 2018 - 12:39

score 2.2k · Answer 11 · 2026-03-28 10:03:21

2.2k

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What does $^{6}P_{3}$ mean here?

Published on 28 Mar 2026 - 10:03

score 41 · Answer 12 · 2018-04-16 13:14:48

41

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Choosing two balls when there are not enough balls of a given colour

Published on 16 Apr 2018 - 13:14

score 45 · Answer 13 · 2026-04-02 07:19:32

45

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An interesting combinatorical counting prolem related to non negative solutions of linear diophantine equations

Published on 02 Apr 2026 - 7:19

score 321 · Answer 14 · 2026-03-29 23:45:21

321

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dimension of ideal of polynomials

Published on 29 Mar 2026 - 23:45

score 656 · Answer 15 · 2018-04-16 16:24:46

656

Views

Number of relations on A that are reflexive and symmetric but not transitive

Published on 16 Apr 2018 - 16:24

List Question

Picking two cards of the same suit

What is the probability that each person ends up with EXACTLY one of the 3 spades when the cards are dealt?

Permutations: an even number of 5 digits not starting with 0

Proving that ${4a \choose 2a} - {2a \choose a}$ is divisible by 4

What is the probability that a domino randomly selected from the set will be a double?

Solving a word problem using a generating function

The $n$-astrolabacus sequence.

What happens with subdivisions of normal fans in Sage?

How to use bijective proof to prove $S(n+1, m+1) = \sum\limits_{k=m}^n S(k, m) × \binom{n}{k}$

prove that $\sum_{k=0}^n \frac{1}{k+1}\binom{2k}{k}\binom{2n-2k}{n-k}=\binom{2n+1}{n}$

What does $^{6}P_{3}$ mean here?

Choosing two balls when there are not enough balls of a given colour

An interesting combinatorical counting prolem related to non negative solutions of linear diophantine equations

dimension of ideal of polynomials

Number of relations on A that are reflexive and symmetric but not transitive

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