Question

How many 5-letter words with a) no letter A b) at least one A

score 1.6k · Answer 1 · 2026-03-29 06:33:47

1.6k

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How many 5-letter words with a) no letter A b) at least one A

Published on 29 Mar 2026 - 6:33

score 465 · Answer 2 · 2026-03-24 22:08:14

465

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Undirected labeled connected graph with K bridges

Published on 24 Mar 2026 - 22:08

score 667 · Answer 3 · 2026-03-26 01:10:52

667

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Casework counting and overcounting: How many numbers can be obtained by adding certain partitions of a set

Published on 26 Mar 2026 - 1:10

score 652 · Answer 4 · 2026-03-29 04:43:57

In how many permutations of $1,2,3...100$ will the 25th number be the minimum of the first 25 numbers, and likewise for the 50th of the first 50?

score 1.9k · Answer 5 · 2026-04-09 05:50:13

1.9k

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

Published on 09 Apr 2026 - 5:50

score 115 · Answer 6 · 2026-04-05 23:52:30

115

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Does $\sum_{n=1}^\infty \frac{T(n)}{2^{2^n}}$ converge?

Published on 05 Apr 2026 - 23:52

score 124 · Answer 7 · 2018-05-13 22:07:15

124

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Number of elements in a finitely generated Dynkin system

Published on 13 May 2018 - 22:07

score 202 · Answer 8 · 2026-03-26 19:03:47

202

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Navy bunk locker code combinations problem

Published on 26 Mar 2026 - 19:03

score 1.8k · Answer 9 · 2026-04-06 06:31:35

1.8k

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Number of $5$-card hands containing exactly two aces

Published on 06 Apr 2026 - 6:31

score 596 · Answer 10 · 2026-03-29 04:47:22

596

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Counting number of 11 digit numbers

Published on 29 Mar 2026 - 4:47

score 93 · Answer 11 · 2026-04-10 01:18:08

93

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Counting number of integer solutions

Published on 10 Apr 2026 - 1:18

score 102 · Answer 12 · 2026-03-26 14:32:00

102

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How to find recurrence for $f(x)$ coefficient in the expression $f(x)\cdot(1+2x+2x^2+x^3)=\frac{1}{1-x^3}$ using generating functions?

Published on 26 Mar 2026 - 14:32

score 216 · Answer 13 · 2026-04-11 03:41:21

216

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Probability of picking exactly one ace?

Published on 11 Apr 2026 - 3:41

score 163 · Answer 14 · 2026-04-06 06:29:43

163

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Rolling $k$ identical dice, how many possibilities are there?

Published on 06 Apr 2026 - 6:29

score 158 · Answer 15 · 2026-04-10 17:42:29

158

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inclusion-exclusion principle integers modulo n

Published on 10 Apr 2026 - 17:42

List Question

How many 5-letter words with a) no letter A b) at least one A

Undirected labeled connected graph with K bridges

Casework counting and overcounting: How many numbers can be obtained by adding certain partitions of a set

In how many permutations of $1,2,3...100$ will the 25th number be the minimum of the first 25 numbers, and likewise for the 50th of the first 50?

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

Does $\sum_{n=1}^\infty \frac{T(n)}{2^{2^n}}$ converge?

Number of elements in a finitely generated Dynkin system

Navy bunk locker code combinations problem

Number of $5$-card hands containing exactly two aces

Counting number of 11 digit numbers

Counting number of integer solutions

How to find recurrence for $f(x)$ coefficient in the expression $f(x)\cdot(1+2x+2x^2+x^3)=\frac{1}{1-x^3}$ using generating functions?

Probability of picking exactly one ace?

Rolling $k$ identical dice, how many possibilities are there?

inclusion-exclusion principle integers modulo n

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