What is subsets number?

Answer 1

For example, if we have a set of numbers called A which has 3 members(in our case numbers):

A={2,5,6}

this set has 8 subsets (2^3) which are as follow:

the empty set: ∅

{2},{5},{6}

{2,5},{2,6},{5,6}

{2,5,6}