Question

Counting derangements on $n$ elements using recurrences?

score 120 · Answer 1 · 2026-04-12 12:10:29

120

Views

Counting derangements on $n$ elements using recurrences?

Published on 12 Apr 2026 - 12:10

score 301 · Answer 2 · 2026-05-11 03:13:26

301

Views

Several rectangles cover the unit square. Can I find a disjoint set of them whose area is at least $1/4$?

Published on 11 May 2026 - 3:13

score 155 · Answer 3 · 2026-04-16 03:10:16

155

Views

Does there exist a similar identity to $\binom{n}{k} = \binom{n}{n-k}$?

Published on 16 Apr 2026 - 3:10

score 450 · Answer 4 · 2026-04-15 23:53:19

450

Views

Selecting r pairwise disjoint subsets from a set of n elements

Published on 15 Apr 2026 - 23:53

score 592 · Answer 5 · 2026-04-15 17:03:23

592

Views

How many selections of three cards can be made from cards bearing the letters of the word EXAMINATION if ...?

Published on 15 Apr 2026 - 17:03

score 113 · Answer 6 · 2026-04-09 19:09:21

113

Views

Explanation of counting by Inclusion Exclusion

Published on 09 Apr 2026 - 19:09

score 82 · Answer 7 · 2026-04-13 03:59:32

82

Views

Sum of zero sum series

Published on 13 Apr 2026 - 3:59

score 49 · Answer 8 · 2026-04-12 21:37:26

49

Views

Recurrence $k$-th pattern by substitution

Published on 12 Apr 2026 - 21:37

score 672 · Answer 9 · 2026-04-16 08:10:02

672

Views

How many ways to arrange four types of books on the shelf so that books of the same type are together?

Published on 16 Apr 2026 - 8:10

score 1.7k · Answer 10 · 2026-05-15 23:57:50

1.7k

Views

Permutations of STATISTICS with one T alone and the other two together

Published on 15 May 2026 - 23:57

score 183 · Answer 11 · 2026-04-15 14:28:41

183

Views

Lower bound of $e(P)$, the amount of linear extensions of a poset $P$ of cardinality $n$

Published on 15 Apr 2026 - 14:28

score 2.2k · Answer 12 · 2026-04-10 01:52:01

2.2k

Views

Probability with replacement, question on balls in urn.

Published on 10 Apr 2026 - 1:52

score 226 · Answer 13 · 2026-04-12 06:03:24

226

Views

Number of ways to choose tuples

Published on 12 Apr 2026 - 6:03

score 70 · Answer 14 · 2026-04-17 03:03:04

70

Views

Stars and bars: estimating maximum distance between bars

Published on 17 Apr 2026 - 3:03

score 348 · Answer 15 · 2026-04-15 02:49:42

Given TECHNOLOGY , find number of distinguishable ways the letters can be arranged in which letters T,E and N are together

List Question

Counting derangements on $n$ elements using recurrences?

Several rectangles cover the unit square. Can I find a disjoint set of them whose area is at least $1/4$?

Does there exist a similar identity to $\binom{n}{k} = \binom{n}{n-k}$?

Selecting r pairwise disjoint subsets from a set of n elements

How many selections of three cards can be made from cards bearing the letters of the word EXAMINATION if ...?

Explanation of counting by Inclusion Exclusion

Sum of zero sum series

Recurrence $k$-th pattern by substitution

How many ways to arrange four types of books on the shelf so that books of the same type are together?

Permutations of STATISTICS with one T alone and the other two together

Lower bound of $e(P)$, the amount of linear extensions of a poset $P$ of cardinality $n$

Probability with replacement, question on balls in urn.

Number of ways to choose tuples

Stars and bars: estimating maximum distance between bars

Given TECHNOLOGY , find number of distinguishable ways the letters can be arranged in which letters T,E and N are together

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