**What is power set in maths:** The **power set** of a set S, written as P(S), is the set of all subsets of S, including the empty set and S itself.

For example, if S = {a, b, c}, then the power set P(S) = {âˆ…, {a}, {b}, {c}, {a, b}, {a, c}, {b, c}, {a, b, c}}.