Question

Count permutation pairs such that for each element, either permutation gives it a different position from its original position

score 46 · Answer 1 · 2026-04-09 11:45:17

46

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Count permutation pairs such that for each element, either permutation gives it a different position from its original position

Published on 09 Apr 2026 - 11:45

score 25 · Answer 2 · 2026-04-16 00:52:57

Given n placements where each placement belongs to {1,2,3,4,5,6}, how many ways can you place each number so that $n_1$ $\geq$ ... $n_k$

score 169 · Answer 3 · 2026-04-16 21:31:20

169

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How many permutations of $a_1, a_2, a_3, ..., a_{2020}$ of $1,2,\ldots,2020$ s.t. $|a_1-1|=|a_2-2|=\ldots=|a_{2020}-{2020}|$?

Published on 16 Apr 2026 - 21:31

score 144 · Answer 4 · 2026-04-16 15:41:11

144

Views

Number of permutations which have support size equal to k

Published on 16 Apr 2026 - 15:41

score 405 · Answer 5 · 2026-03-25 08:09:19

405

Views

Poker Probability with hands of 6 cards

Published on 25 Mar 2026 - 8:09

score 1.3k · Answer 6 · 2026-04-15 14:54:27

1.3k

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Probabilities of the sum of two cards - the sum of two cards equaling a number

Published on 15 Apr 2026 - 14:54

score 1.1k · Answer 7 · 2026-04-12 01:38:39

1.1k

Views

Probability of getting 2 consecutive cards

Published on 12 Apr 2026 - 1:38

score 1.3k · Answer 8 · 2026-04-14 09:20:13

1.3k

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In how many ways can we distribute 10 identical ice creams to 4 people so one of them gets a maximum of 4 ice cream?

Published on 14 Apr 2026 - 9:20

score 51 · Answer 9 · 2026-04-14 02:16:04

51

Views

Even permutation vs even function

Published on 14 Apr 2026 - 2:16

score 275 · Answer 10 · 2026-04-13 03:52:09

275

Views

Normal subgroups of k-transitive groups.

Published on 13 Apr 2026 - 3:52

score 473 · Answer 11 · 2026-04-16 15:38:09

473

Views

How many ways to choose $n$ distinct objects from a set of $m$ objects?

Published on 16 Apr 2026 - 15:38

score 38 · Answer 12 · 2026-04-14 04:08:43

38

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How many 5-man starting line-ups are possible?

Published on 14 Apr 2026 - 4:08

score 53 · Answer 13 · 2026-04-11 22:19:46

53

Views

If $\beta = (172543)$, calculate $\beta^8$

Published on 11 Apr 2026 - 22:19

score 357 · Answer 14 · 2026-04-16 18:44:37

357

Views

Permutation: solutions to linear equation: Compute the number of all solutions $(x_1, x_2,\dots, x_n)$ of the equation $x_1+x_2+\dots+x_n=k$

Published on 16 Apr 2026 - 18:44

score 231 · Answer 15 · 2026-03-26 08:00:40

231

Views

The Number of permutations of [n] such that $|\pi(i)-i|\leq 2$

Published on 26 Mar 2026 - 8:00

List Question

Count permutation pairs such that for each element, either permutation gives it a different position from its original position

Given n placements where each placement belongs to {1,2,3,4,5,6}, how many ways can you place each number so that $n_1$ $\geq$ ... $n_k$

How many permutations of $a_1, a_2, a_3, ..., a_{2020}$ of $1,2,\ldots,2020$ s.t. $|a_1-1|=|a_2-2|=\ldots=|a_{2020}-{2020}|$?

Number of permutations which have support size equal to k

Poker Probability with hands of 6 cards

Probabilities of the sum of two cards - the sum of two cards equaling a number

Probability of getting 2 consecutive cards

In how many ways can we distribute 10 identical ice creams to 4 people so one of them gets a maximum of 4 ice cream?

Even permutation vs even function

Normal subgroups of k-transitive groups.

How many ways to choose $n$ distinct objects from a set of $m$ objects?

How many 5-man starting line-ups are possible?

If $\beta = (172543)$, calculate $\beta^8$

Permutation: solutions to linear equation: Compute the number of all solutions $(x_1, x_2,\dots, x_n)$ of the equation $x_1+x_2+\dots+x_n=k$

The Number of permutations of [n] such that $|\pi(i)-i|\leq 2$

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