Combinations and Permutations - Combinatorics

Combinatorics is the field of mathematics dealing with problems of selection, arrangement and operation belonging to a finite set in accordance with certain constraints.

Combinations and permutations are two different ways of grouping elements of a set into subsets.

In a combination, the elements of the subset can be represented in any order.

In a permutation, the elements of the subset are represented in a specific order.