Question

Show that $3\cdot \frac{n!}{(n-2)!} + 210 = \frac{(2n)!}{(2n-2))!}$ for a specific n.

score 87 · Answer 1 · 2018-04-22 13:14:48

87

Views

Show that $3\cdot \frac{n!}{(n-2)!} + 210 = \frac{(2n)!}{(2n-2))!}$ for a specific n.

Published on 22 Apr 2018 - 13:14

score 47 · Answer 2 · 2018-04-22 13:42:34

47

Views

Number of ways in which 4 letter words can formed by using the letters from the set-a,a,a,a,b,b,b,c,c,d

Published on 22 Apr 2018 - 13:42

score 64 · Answer 3 · 2026-03-26 12:58:06

64

Views

How can I distribute $n$ distinguishable items to $r$ indistinguishable groups such that...

Published on 26 Mar 2026 - 12:58

score 157 · Answer 4 · 2026-03-22 11:52:07

157

Views

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Published on 22 Mar 2026 - 11:52

score 294 · Answer 5 · 2026-03-25 06:08:13

294

Views

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Published on 25 Mar 2026 - 6:08

score 111 · Answer 6 · 2018-04-23 15:39:53

111

Views

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Published on 23 Apr 2018 - 15:39

score 597 · Answer 7 · 2018-04-23 16:14:38

597

Views

Combinatorics - Removing Double Counted Cases

Published on 23 Apr 2018 - 16:14

score 348 · Answer 8 · 2018-04-23 17:26:27

348

Views

How many different ways are there for eight men and five women to stand in a line so that no two women stand next to each other?

Published on 23 Apr 2018 - 17:26

score 3.5k · Answer 9 · 2026-03-26 14:28:04

3.5k

Views

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Published on 26 Mar 2026 - 14:28

score 58 · Answer 10 · 2026-03-25 06:04:47

58

Views

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Published on 25 Mar 2026 - 6:04

score 28 · Answer 11 · 2018-04-25 16:09:58

28

Views

Problem on Passwords (combination)

Published on 25 Apr 2018 - 16:09

score 362 · Answer 12 · 2026-03-25 09:39:49

362

Views

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Published on 25 Mar 2026 - 9:39

score 45 · Answer 13 · 2026-03-26 15:16:40

45

Views

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Published on 26 Mar 2026 - 15:16

score 71 · Answer 14 · 2026-03-25 09:50:52

71

Views

Power profile of permutation matrices

Published on 25 Mar 2026 - 9:50

score 842 · Answer 15 · 2018-04-26 10:03:48

842

Views

Possible permutations, how to work out the maths

Published on 26 Apr 2018 - 10:03

List Question

Show that $3\cdot \frac{n!}{(n-2)!} + 210 = \frac{(2n)!}{(2n-2))!}$ for a specific n.

Number of ways in which 4 letter words can formed by using the letters from the set-a,a,a,a,b,b,b,c,c,d

How can I distribute $n$ distinguishable items to $r$ indistinguishable groups such that...

Number of unique permutations of a 3x3x3 cube, including transforms

Describe a natural group action

How many different patterns to transport load with these condition?

Combinatorics - Removing Double Counted Cases

How many different ways are there for eight men and five women to stand in a line so that no two women stand next to each other?

When to use Permutations and Combinations

The nonexistence of 8-transitive graphs

Problem on Passwords (combination)

Understanding distribution using Stirling number of the second kind inclusion exclusion approach

Struggling to write equivalence relation

Power profile of permutation matrices

Possible permutations, how to work out the maths

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