Question

Given the set of all strings of length 5 over the alphabet {a, b, c, d, e, f, g, h}, how many strings begin or end with an "e"?

score 367 · Answer 1 · 2026-03-26 19:20:11

367

Views

Given the set of all strings of length 5 over the alphabet {a, b, c, d, e, f, g, h}, how many strings begin or end with an "e"?

Published on 26 Mar 2026 - 19:20

score 106 · Answer 2 · 2026-03-26 21:12:39

106

Views

How many strings can be formed by reordering the letters ABCDEF so that each string contains the substring EA or the substring CE or both?

Published on 26 Mar 2026 - 21:12

score 234 · Answer 3 · 2026-03-26 21:10:17

234

Views

Find number of legal codes containing even number of zeros

Published on 26 Mar 2026 - 21:10

score 124 · Answer 4 · 2026-03-26 19:19:01

124

Views

Given $m$ objects of type A and $n$ objects of type B, arrange them such that there are not more than two consecutive objects of type B.

Published on 26 Mar 2026 - 19:19

score 397 · Answer 5 · 2026-03-26 19:23:49

397

Views

Combinatorics 1 by n tiling problem generating function

Published on 26 Mar 2026 - 19:23

score 53 · Answer 6 · 2026-04-11 10:50:49

53

Views

number of n length binary strings not containing specific factor [SOLVED].

Published on 11 Apr 2026 - 10:50

score 191 · Answer 7 · 2026-05-10 16:32:47

191

Views

Inequality regarding kostka numbers in representation theory

Published on 10 May 2026 - 16:32

score 62 · Answer 8 · 2026-03-26 19:18:48

62

Views

Recovering an element of a free group from its projections

Published on 26 Mar 2026 - 19:18

score 126 · Answer 9 · 2026-03-26 09:26:56

126

Views

Number of Distinct Words of arbitrary length $k$ in Euclidean N-Space (i.e; $\mathbb{Z}^N$)

Published on 26 Mar 2026 - 9:26

score 109 · Answer 10 · 2026-03-26 21:12:24

109

Views

"No two $0$'s together" versus "No two consecutive $0$'s"

Published on 26 Mar 2026 - 21:12

score 223 · Answer 11 · 2026-03-26 19:16:53

223

Views

Understanding Smirnov words in analytic combinatorics

Published on 26 Mar 2026 - 19:16

score 70 · Answer 12 · 2026-03-26 19:20:03

70

Views

Number of strings of length $n$ over {$x,y,z$} where $x$ and $y$ appear at least once

Published on 26 Mar 2026 - 19:20

score 93 · Answer 13 · 2026-03-26 06:20:36

93

Views

Defining permutations of multiset using bijections

Published on 26 Mar 2026 - 6:20

score 59 · Answer 14 · 2026-05-11 02:42:55

59

Views

Formula for the Wythoff array from the infinite Fibonacci word

Published on 11 May 2026 - 2:42

score 76 · Answer 15 · 2026-03-26 19:20:10

76

Views

There are $n! $ word made from a world of n different letter by reversing the "maximum" number between the initial letters

Published on 26 Mar 2026 - 19:20

List Question

Given the set of all strings of length 5 over the alphabet {a, b, c, d, e, f, g, h}, how many strings begin or end with an "e"?

How many strings can be formed by reordering the letters ABCDEF so that each string contains the substring EA or the substring CE or both?

Find number of legal codes containing even number of zeros

Given $m$ objects of type A and $n$ objects of type B, arrange them such that there are not more than two consecutive objects of type B.

Combinatorics 1 by n tiling problem generating function

number of n length binary strings not containing specific factor [SOLVED].

Inequality regarding kostka numbers in representation theory

Recovering an element of a free group from its projections

Number of Distinct Words of arbitrary length $k$ in Euclidean N-Space (i.e; $\mathbb{Z}^N$)

"No two $0$'s together" versus "No two consecutive $0$'s"

Understanding Smirnov words in analytic combinatorics

Number of strings of length $n$ over {$x,y,z$} where $x$ and $y$ appear at least once

Defining permutations of multiset using bijections

Formula for the Wythoff array from the infinite Fibonacci word

There are $n! $ word made from a world of n different letter by reversing the "maximum" number between the initial letters

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