How to express the condition in permutation formula.
135408
Solving permutation problem sequentially.
10927
How to write conditional equations with one-sided curly brackets
53312
Multiplication principle and permutation
56327
How to find the square root of a permutation
12350
How do you put conditions on indices in a sum?
142477
Closed-form expression for the number of $k$-permutations of length $n$. Duplicates allowed!
143427
Counting existing permutations in R
105452
permutation in c#
147766
Sum of Permutations from 0 to n
134375
LaTeX conditional expression
106603
How to tell if an array is a permutation in O(n)?
131863
Permutation question on alphabets
20478
Mathematical expression for $n$ largest values in a set
39953
$a\mid b,\ c\mid d\,\Rightarrow\ ac\mid bd $ $\ \, \bf\small [Divisibility\ Product\ Rule]$
17268
Cycles in permutations of a given size
41294
Permutation module of $S_n$
72990
Typesetting permutations with latex