Counting the number of permutations of a set of n elements with k fixed points
11182
Derivation of the Partial Derangement (Rencontres numbers) formula
97254
What is the proof of permutations of similar objects?
23322
Combinatorics Inclusion - Exclusion Principle
8458
Combinatorics problem based on Ferrers graph
45448
Minimum number of $k$-partitions of a set of size $n$ to enumerate all $n \choose k$ combinations
113953
Circular permutations with indistinguishable objects
70967
Permutation with prime order, fixed point
70327
the numer of partial function between two sets in combinatoric way
108747
A simple permutation question - discrete math
155831
What are the total number of ordered permutations of a list of elements (possibly repeated)?
41294
Permutation module of $S_n$
153721
Conjugating a permutation
4555
How to write permutations as product of disjoint cycles and transpositions
88356
Number of options to distribute $N$ different balls to $K$ numbered cells
35648
How many permutations of the set n={1,2,3,3,3,4,4,5} are possible without any consecutive identical elements?
107010
How many elements of order $k$ are in $S_n$?
26343
Number of certain (0,1)-matrices, Stanley's Enumerative Combinatorics