Question

Stirling numbers of the second kind - proof 2

score 155 · Answer 1 · 2026-05-15 23:12:35

155

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Stirling numbers of the second kind - proof 2

Published on 15 May 2026 - 23:12

score 23 · Answer 2 · 2026-05-10 16:13:39

23

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How do I count how many ways to place 8 cards of only 2 ranks (suits ignored) into 16 possible positions?

Published on 10 May 2026 - 16:13

score 113 · Answer 3 · 2026-04-17 13:37:46

113

Views

Permutations when there are pairs or similar units

Published on 17 Apr 2026 - 13:37

score 52 · Answer 4 · 2026-04-14 16:24:27

52

Views

Counting four-digit numbers that start with an even (possibly zero), end with an odd, and have no repetitions

Published on 14 Apr 2026 - 16:24

score 136 · Answer 5 · 2026-05-10 15:13:22

136

Views

Odd of the form $a^2+b^2+c^2+ab+ac+bc$.

Published on 10 May 2026 - 15:13

score 1.1k · Answer 6 · 2026-05-10 22:01:44

1.1k

Views

Represent $N$ as the sum of exactly $K$ distinct positive integers

Published on 10 May 2026 - 22:01

score 906 · Answer 7 · 2026-04-13 16:12:26

906

Views

What is the probability that $m$ is the largest number drawn?

Published on 13 Apr 2026 - 16:12

score 1.5k · Answer 8 · 2026-04-14 17:44:14

1.5k

Views

How many 3 digit numbers have no zeros, how many have no zeros or fives...

Published on 14 Apr 2026 - 17:44

score 127 · Answer 9 · 2026-04-13 20:20:03

127

Views

What is the graph coloring problem that Paul Erdős offered $25 to solve circa 1979?

Published on 13 Apr 2026 - 20:20

score 74 · Answer 10 · 2026-04-16 02:54:22

74

Views

Proving that in a finite set $S$, there is an element $a \in S$ such that $a*a=a$

Published on 16 Apr 2026 - 2:54

score 76 · Answer 11 · 2026-04-12 13:52:17

76

Views

Need further explanation for this problem

Published on 12 Apr 2026 - 13:52

score 1.2k · Answer 12 · 2026-04-09 14:16:54

1.2k

Views

Counting Problem on Truth Tables

Published on 09 Apr 2026 - 14:16

score 1.4k · Answer 13 · 2026-05-10 15:52:32

1.4k

Views

In a shuffled deck, are the probabilities of finding one pair of cards and a second pair of cards independent events?

Published on 10 May 2026 - 15:52

score 3.7k · Answer 14 · 2026-04-15 06:55:36

3.7k

Views

How many cycles of each type are in $S_6$

Published on 15 Apr 2026 - 6:55

score 78 · Answer 15 · 2026-04-14 04:37:19

There are 4 girls and 4 boys including John and Martin. In how many ways can they be arranged such that two girls will be behind John and Martin?

List Question

Stirling numbers of the second kind - proof 2

How do I count how many ways to place 8 cards of only 2 ranks (suits ignored) into 16 possible positions?

Permutations when there are pairs or similar units

Counting four-digit numbers that start with an even (possibly zero), end with an odd, and have no repetitions

Odd of the form $a^2+b^2+c^2+ab+ac+bc$.

Represent $N$ as the sum of exactly $K$ distinct positive integers

What is the probability that $m$ is the largest number drawn?

How many 3 digit numbers have no zeros, how many have no zeros or fives...

What is the graph coloring problem that Paul Erdős offered $25 to solve circa 1979?

Proving that in a finite set $S$, there is an element $a \in S$ such that $a*a=a$

Need further explanation for this problem

Counting Problem on Truth Tables

In a shuffled deck, are the probabilities of finding one pair of cards and a second pair of cards independent events?

How many cycles of each type are in $S_6$

There are 4 girls and 4 boys including John and Martin. In how many ways can they be arranged such that two girls will be behind John and Martin?

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