Question

A procedure for sampling paths in a directed acyclic graph

score 874 · Answer 1 · 2026-04-03 19:36:39

874

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A procedure for sampling paths in a directed acyclic graph

Published on 03 Apr 2026 - 19:36

score 1.9k · Answer 2 · 2026-03-27 13:44:33

1.9k

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How many different three-digit numbers contain both the digit $2$ and the digit $6$?

Published on 27 Mar 2026 - 13:44

score 38 · Answer 3 · 2018-03-02 04:39:17

38

Views

permutation such that adding its location to each element creates a new permutation

Published on 02 Mar 2018 - 4:39

score 128 · Answer 4 · 2026-03-25 11:14:51

128

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How fast does $\frac{1}{n!} \sum_{k=0}^n k(n-k)!$ grow, as a function of $n$?

Published on 25 Mar 2026 - 11:14

score 97 · Answer 5 · 2026-03-25 15:42:34

97

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Show that each vertex $v$ of a tree $T$ appears $\deg(v)-1$ times in Prüfer sequence of $T$.

Published on 25 Mar 2026 - 15:42

score 657 · Answer 6 · 2026-03-27 13:42:09

657

Views

Determine the number of permutations of {1,2,...,9} in which exactly one odd integer is in its natural position.

Published on 27 Mar 2026 - 13:42

score 168 · Answer 7 · 2026-03-25 09:22:44

168

Views

A problem of combinatorics (reduced from a problem of computing probability generating function)

Published on 25 Mar 2026 - 9:22

score 61 · Answer 8 · 2018-03-02 11:01:20

61

Views

Grid navigation

Published on 02 Mar 2018 - 11:01

score 249 · Answer 9 · 2018-03-02 15:02:13

249

Views

Explanation for an unordered sampling with replacement question

Published on 02 Mar 2018 - 15:02

score 59 · Answer 10 · 2018-03-02 15:21:44

59

Views

Probability of getting N distinct types of objects in r tries from a set of N distinct objects

Published on 02 Mar 2018 - 15:21

score 11.5k · Answer 11 · 2018-03-02 16:17:29

In how many ways can six different gifts be given to five different children with each child receiving at least one gift?

score 45 · Answer 12 · 2018-03-02 18:07:13

45

Views

Picking one of each color

Published on 02 Mar 2018 - 18:07

score 78 · Answer 13 · 2026-03-25 19:01:37

78

Views

Showing an identity between polynomials whose coefficients involve combinatorial identities

Published on 25 Mar 2026 - 19:01

score 196 · Answer 14 · 2026-03-25 19:11:38

196

Views

Number of rectangles in a grid of size at least $W \times H$

Published on 25 Mar 2026 - 19:11

score 141 · Answer 15 · 2026-03-25 02:53:45

141

Views

Can you place $15$ integers around a circle such that sum of every $4$ consecutive numbers is either $1 $ or $ 3$?

Published on 25 Mar 2026 - 2:53

List Question

A procedure for sampling paths in a directed acyclic graph

How many different three-digit numbers contain both the digit $2$ and the digit $6$?

permutation such that adding its location to each element creates a new permutation

How fast does $\frac{1}{n!} \sum_{k=0}^n k(n-k)!$ grow, as a function of $n$?

Show that each vertex $v$ of a tree $T$ appears $\deg(v)-1$ times in Prüfer sequence of $T$.

Determine the number of permutations of {1,2,...,9} in which exactly one odd integer is in its natural position.

A problem of combinatorics (reduced from a problem of computing probability generating function)

Grid navigation

Explanation for an unordered sampling with replacement question

Probability of getting N distinct types of objects in r tries from a set of N distinct objects

In how many ways can six different gifts be given to five different children with each child receiving at least one gift?

Picking one of each color

Showing an identity between polynomials whose coefficients involve combinatorial identities

Number of rectangles in a grid of size at least $W \times H$

Can you place $15$ integers around a circle such that sum of every $4$ consecutive numbers is either $1 $ or $ 3$?

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