Derivation Of Number Of Derangements Of An N Set

Derivation of number of derangements of an n-set

Derivation of number of derangements of an n-set
Definition of Derangement
Derangement Formula
Derangement of a Single Element
Derangement of Multiple Elements
Derivation of Derangement Formula
Using Inclusion-Exclusion Principle
Using Recurrence Relation
Explanation of Inclusion-Exclusion Principle
Explanation of Recurrence Relation