How to count the number of good permutations?
109826
Probability of list having a pair of unchanged consecutive elements once ordered
38809
In how many ways can the letters of word $PERMUTATIONS$ be arranged if there are always 4 letters between P and S?
108747
A simple permutation question - discrete math
46999
How many fixed points in a permutation
101751
The number of words that can be made by permuting the letters of _MATHEMATICS_ is
122504
Factorisations of permutations
112188
Duplicate Permutations with Tuples
81231
Count the permutations which are products of exactly two disjoint cycles.
140630
Permutations in JavaScript?
119292
How to generate all permutations of an array in sorted order?
86394
EVERGREEN string question. Combinations and permutations
6204
How many permutations of $\{1, \ldots, n\}$ exist such that none of them contain $(i, i+1)$ (as a sequence) for $i \in {1,...,(n-1)}$?
115209
Elementary formula for permutations?
106603
How to tell if an array is a permutation in O(n)?
116647
The number of different ways to choose $k$ out of $n$ unique items
73323
Permutations when some objects are alike
59087
permutations of two lists in python