Question

Exponential Generating Function For Derangements

score 11.9k · Answer 1 · 2012-11-19 04:05:12

11.9k

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Exponential Generating Function For Derangements

Published on 19 Nov 2012 - 4:05

score 459 · Answer 2 · 2012-11-29 12:41:02

459

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Derangements with repetitive numbers

Published on 29 Nov 2012 - 12:41

score 3k · Answer 3 · 2013-02-13 10:50:59

3k

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Generating a random derangement

Published on 13 Feb 2013 - 10:50

score 6k · Answer 4 · 2013-03-19 13:34:08

6k

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Derangement problem!

Published on 19 Mar 2013 - 13:34

score 97 · Answer 5 · 2020-08-01 04:27:13

97

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What is wrong with this derangement argument $((n-1) !(n-1))$?

Published on 01 Aug 2020 - 4:27

score 51 · Answer 6 · 2020-08-05 20:30:49

51

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Given n digits and k existing permutations, finding the number of possible permutations where positions aren't repeated.

Published on 05 Aug 2020 - 20:30

score 373 · Answer 7 · 2020-08-10 06:43:51

373

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An alternate solution to the hat-matching problem, probability of exactly $k$ matches

Published on 10 Aug 2020 - 6:43

score 267 · Answer 8 · 2020-09-05 02:12:09

267

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What is the probability of matching numbered letters to numbered envelopes?

Published on 05 Sep 2020 - 2:12

score 147 · Answer 9 · 2020-09-13 12:39:39

147

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Number of ways to keep two decks of cards in front of each other with no matching cards facing each other.

Published on 13 Sep 2020 - 12:39

score 72 · Answer 10 · 2020-09-14 18:23:20

72

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Derangements Problem: Color Water

Published on 14 Sep 2020 - 18:23

score 178 · Answer 11 · 2020-09-23 14:06:24

178

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Inclusion Exclusion combinatorics problem.

Published on 23 Sep 2020 - 14:06

score 105 · Answer 12 · 2020-10-12 06:38:09

105

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The Hat Problem: why use PIE?

Published on 12 Oct 2020 - 6:38

score 342 · Answer 13 · 2020-10-14 18:24:11

342

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Prove that $n! = \sum_{k=0}^n\binom{n}{k}d_k,$ where $d_n$ is the number of derangements of ${1,2,..., n}$.

Published on 14 Oct 2020 - 18:24

score 1.2k · Answer 14 · 2020-10-15 16:34:11

1.2k

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Why does this probability converge towards $1-\frac{1}{e}$?

Published on 15 Oct 2020 - 16:34

score 244 · Answer 15 · 2020-10-17 13:57:36

244

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How to obtain this formulae for derangement using Principle of Inclusion and Exclusion

Published on 17 Oct 2020 - 13:57

List Question

Exponential Generating Function For Derangements

Derangements with repetitive numbers

Generating a random derangement

Derangement problem!

What is wrong with this derangement argument $((n-1) !(n-1))$?

Given n digits and k existing permutations, finding the number of possible permutations where positions aren't repeated.

An alternate solution to the hat-matching problem, probability of exactly $k$ matches

What is the probability of matching numbered letters to numbered envelopes?

Number of ways to keep two decks of cards in front of each other with no matching cards facing each other.

Derangements Problem: Color Water

Inclusion Exclusion combinatorics problem.

The Hat Problem: why use PIE?

Prove that $n! = \sum_{k=0}^n\binom{n}{k}d_k,$ where $d_n$ is the number of derangements of ${1,2,..., n}$.

Why does this probability converge towards $1-\frac{1}{e}$?

How to obtain this formulae for derangement using Principle of Inclusion and Exclusion

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