Question

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

score 295 · Answer 1 · 2026-04-29 12:42:40

295

Views

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

Published on 29 Apr 2026 - 12:42

score 224 · Answer 2 · 2026-04-29 12:42:34

224

Views

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

Published on 29 Apr 2026 - 12:42

score 5.6k · Answer 3 · 2026-04-29 12:42:41

5.6k

Views

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

Published on 29 Apr 2026 - 12:42

score 77 · Answer 4 · 2026-05-07 11:28:13

77

Views

Count probability of getting rectangle

Published on 07 May 2026 - 11:28

score 86 · Answer 5 · 2026-04-29 12:42:36

86

Views

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

Published on 29 Apr 2026 - 12:42

score 58 · Answer 6 · 2026-05-05 02:02:11

58

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 05 May 2026 - 2:02

score 1.5k · Answer 7 · 2026-04-29 12:42:35

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 29 Apr 2026 - 12:42

score 162 · Answer 8 · 2026-04-29 12:42:39

162

Views

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

Published on 29 Apr 2026 - 12:42

score 1.6k · Answer 9 · 2026-04-29 12:30:32

1.6k

Views

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

Published on 29 Apr 2026 - 12:30

score 5.6k · Answer 10 · 2026-05-07 12:48:25

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 07 May 2026 - 12:48

score 301 · Answer 11 · 2026-04-29 12:42:28

301

Views

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

Published on 29 Apr 2026 - 12:42

score 639 · Answer 12 · 2026-05-07 20:10:03

639

Views

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

Published on 07 May 2026 - 20:10

score 335 · Answer 13 · 2026-04-29 12:42:41

335

Views

In how many ways a commitee of three people

Published on 29 Apr 2026 - 12:42

score 61 · Answer 14 · 2026-05-03 17:36:39

61

Views

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

Published on 03 May 2026 - 17:36

score 552 · Answer 15 · 2026-04-29 12:42:35

552

Views

Formula for counting distinct n- letter long array permutations

Published on 29 Apr 2026 - 12:42

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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