Power set – Sets

Given set A, the collection of all subsets of A is called the power set of A.It is usually denoted by P(A) or 2A.

Example: If A = {1, 2, 3} then P(A) = {∅, {1}, {2}, {3}, {1, 2}, {2, 3}, {3, 1}, {1, 2, 3}}