Question

The number of possibilities to place exactly one letter in its correct envelope.

score 289 · Answer 1 · 2018-01-17 09:09:17

289

Views

The number of possibilities to place exactly one letter in its correct envelope.

Published on 17 Jan 2018 - 9:09

score 218 · Answer 2 · 2018-01-17 12:07:40

218

Views

How many permutations of $n$ elements start with the first element? or any of the $n$ elements?

Published on 17 Jan 2018 - 12:07

score 5.6k · Answer 3 · 2018-01-17 12:25:20

5.6k

Views

Arranging $12$ different books on a shelf so that $3$ particular books are never together

Published on 17 Jan 2018 - 12:25

score 67 · Answer 4 · 2026-03-22 09:39:57

67

Views

Count probability of getting rectangle

Published on 22 Mar 2026 - 9:39

score 80 · Answer 5 · 2026-03-17 20:20:05

80

Views

Arranging a special permutation of the sequence (1,2,3..., n) into a circle

Published on 17 Mar 2026 - 20:20

score 50 · Answer 6 · 2026-03-24 12:26:36

50

Views

Probability of future success when trials are dependent: In 4 draws w/o replacement, what is the probability that draws 3 & 4 will be successful?

Published on 24 Mar 2026 - 12:26

score 1.5k · Answer 7 · 2018-01-18 11:25:58

1.5k

Views

Find the number of ways of arranging 6 women and 3 men to stand in a row so that all 6 women are standing together?

Published on 18 Jan 2018 - 11:25

score 156 · Answer 8 · 2018-01-18 11:37:55

156

Views

Four male and five female members of a commission are to sit in a meeting on a round table

Published on 18 Jan 2018 - 11:37

score 1.6k · Answer 9 · 2026-03-22 11:01:58

1.6k

Views

Sum of all numbers formed by digits 1,2,3,4 & 5.

Published on 22 Mar 2026 - 11:01

score 5.6k · Answer 10 · 2026-03-22 09:51:30

5.6k

Views

The number of four digit numbers that can be formed from digits 0,1,2,3,4,5,6,7 if each number contains digit 1 is

Published on 22 Mar 2026 - 9:51

score 291 · Answer 11 · 2026-03-19 18:57:55

291

Views

Prove that $\sigma$ is a power of $\tau$ when they commute $\sigma\tau=\tau\sigma$.

Published on 19 Mar 2026 - 18:57

score 634 · Answer 12 · 2026-03-19 22:45:23

634

Views

Prove combination arguments $c(c(n,2),2) = 3c(n,3)+3c(n,4)$

Published on 19 Mar 2026 - 22:45

score 329 · Answer 13 · 2026-03-17 10:16:45

329

Views

In how many ways a commitee of three people

Published on 17 Mar 2026 - 10:16

score 52 · Answer 14 · 2026-03-22 09:33:10

52

Views

$e^{n/e}$ estimate of the maximum order of permutation group element: proof

Published on 22 Mar 2026 - 9:33

score 544 · Answer 15 · 2026-03-17 17:38:44

544

Views

Formula for counting distinct n- letter long array permutations

Published on 17 Mar 2026 - 17:38

List Question

The number of possibilities to place exactly one letter in its correct envelope.

How many permutations of $n$ elements start with the first element? or any of the $n$ elements?

Arranging $12$ different books on a shelf so that $3$ particular books are never together

Count probability of getting rectangle

Arranging a special permutation of the sequence (1,2,3..., n) into a circle

Probability of future success when trials are dependent: In 4 draws w/o replacement, what is the probability that draws 3 & 4 will be successful?

Find the number of ways of arranging 6 women and 3 men to stand in a row so that all 6 women are standing together?

Four male and five female members of a commission are to sit in a meeting on a round table

Sum of all numbers formed by digits 1,2,3,4 & 5.

The number of four digit numbers that can be formed from digits 0,1,2,3,4,5,6,7 if each number contains digit 1 is

Prove that $\sigma$ is a power of $\tau$ when they commute $\sigma\tau=\tau\sigma$.

Prove combination arguments $c(c(n,2),2) = 3c(n,3)+3c(n,4)$

In how many ways a commitee of three people

$e^{n/e}$ estimate of the maximum order of permutation group element: proof

Formula for counting distinct n- letter long array permutations

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