List questions from permutations

Published on 01 Dec 2018 - 3:32

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Smallest number of turns needed to flip $P$ pencils, $N$ per turn, until they all point opposite their starting direction

Published on 29 Mar 2026 - 10:08

70

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$1,2, \ldots, n$ are permuted. None of the numbers $1,2,3$ are adjacent and $n>4$.

Published on 01 Dec 2018 - 9:47

824

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$7$ Sylow subgroup of $A_{20}$ is not normal and $7$ Sylow subgroup of $S_{20}$ contained in $A_{20}$.

Published on 26 Mar 2026 - 4:35

25

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find all $x \in S_5$ such that $x^3 = (12)$

Published on 25 Mar 2026 - 6:03

41

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Discrete Probability: Uniformly random subsets, permutations and birthday probability

Published on 01 Dec 2018 - 22:24

42

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How many bit strings of length $8$ have $3$ x's in a row?

Published on 02 Dec 2018 - 16:24

1.9k

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Why are permutations (nPr) called variations in non-English languages?

Published on 25 Mar 2026 - 23:08

23

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Properties of sets of permutations

Published on 02 Dec 2018 - 17:35

968

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Expected Value for uniform random permutations

Published on 27 Mar 2026 - 18:26

129

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Permutations and terminology

Published on 25 Mar 2026 - 7:47

1.2k

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How many ways can I arrange 5 As, 6 Bs, and 3 Cs

Published on 02 Dec 2018 - 23:17

64

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What is the probability that only one of the cards will have the matching suit?

Published on 25 Mar 2026 - 5:07

2.8k

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Higher Order Multivariable Taylor Expansions

Published on 26 Mar 2026 - 4:28

223

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Probability of overlap of random intervals dropped on unit circle

Published on 01 Apr 2026 - 15:52

List Question

How to calculate a subgroup of some permutation?

Smallest number of turns needed to flip $P$ pencils, $N$ per turn, until they all point opposite their starting direction

$1,2, \ldots, n$ are permuted. None of the numbers $1,2,3$ are adjacent and $n>4$.

$7$ Sylow subgroup of $A_{20}$ is not normal and $7$ Sylow subgroup of $S_{20}$ contained in $A_{20}$.

find all $x \in S_5$ such that $x^3 = (12)$

Discrete Probability: Uniformly random subsets, permutations and birthday probability

How many bit strings of length $8$ have $3$ x's in a row?

Why are permutations (nPr) called variations in non-English languages?

Properties of sets of permutations

Expected Value for uniform random permutations

Permutations and terminology

How many ways can I arrange 5 As, 6 Bs, and 3 Cs

What is the probability that only one of the cards will have the matching suit?

Higher Order Multivariable Taylor Expansions

Probability of overlap of random intervals dropped on unit circle

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