List questions from derangements

Published on 07 Feb 2018 - 17:16

742

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Derangement formula for multisets

Published on 18 Mar 2018 - 11:22

468

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Recursive algorithm for generating derangements

Published on 02 Apr 2018 - 15:52

542

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How do I prove the number of derangements formula $nD_{n - 1} + (-1)^n$ intuitively?

Published on 30 Apr 2018 - 19:32

1.9k

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Derangement recurrence $D(n) = nD(n-1) + (-1)^n$

Published on 13 May 2018 - 20:13

236

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Can't prove this algebraically $\sum\limits_{i = 0}^n { n \choose i } \, !i = n! $

Published on 13 Jul 2018 - 18:37

1k

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$10$ letters are placed in $10$ addressed envelopes. Find the number of ways such that at most three letters are not in correct envelopes

Published on 28 Aug 2018 - 7:07

76

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Derangement of Odd Objects

Published on 31 Aug 2018 - 17:45

828

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10 names in a hat — odds that no one picks themself?

Published on 18 Nov 2018 - 18:49

43

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How to prove these two derangement number formulas are equivalent?

Published on 24 Nov 2018 - 20:08

596

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Seating Arrangement with Derangement

Published on 05 Dec 2018 - 4:44

870

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Probability Question - A large number, $N$ , people go to a convention at a hotel. Each person is assigned one of $N $ hotel rooms....

Published on 03 Jan 2019 - 16:08

2k

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Prove recurrence relation of Derangement : $D_n = (n-1)(D_{n-2} +D_{n-1})$

Published on 28 Mar 2019 - 9:00

122

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Derangements and permutations

Published on 02 Apr 2019 - 22:18

47

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How is the derangement formula applicable here?

Published on 07 May 2019 - 4:48

List Question

Double derangement permutation

Derangement formula for multisets

Recursive algorithm for generating derangements

How do I prove the number of derangements formula $nD_{n - 1} + (-1)^n$ intuitively?

Derangement recurrence $D(n) = nD(n-1) + (-1)^n$

Can't prove this algebraically $\sum\limits_{i = 0}^n { n \choose i } \, !i = n! $

$10$ letters are placed in $10$ addressed envelopes. Find the number of ways such that at most three letters are not in correct envelopes

Derangement of Odd Objects

10 names in a hat — odds that no one picks themself?

How to prove these two derangement number formulas are equivalent?

Seating Arrangement with Derangement

Probability Question - A large number, $N$ , people go to a convention at a hotel. Each person is assigned one of $N $ hotel rooms....

Prove recurrence relation of Derangement : $D_n = (n-1)(D_{n-2} +D_{n-1})$

Derangements and permutations

How is the derangement formula applicable here?

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