Permutations with repetition

permutations_with_repetition(Integer, Integer, ..., Integer)

permutations_with_repetition(Integer, List | Vector)

Given an integer $n$ and a set of integers $n_1, ..., n_r$ satisfying the conditions above, computes the number of permutations for $n$ elements taken from $r$ different elements and such that the $i$-th element repeats $n_i$ times.

Given an integer $n$ and a list or vector of $n$ elements, comprised of $r$ different elements and such that the $i$-th element repeats $n_i$ times, returns a list of all the different distinct permutations (in lexicographical order).

Permutations, Combinations, Combinations with repetition, Variations, Variations with repetition