What subset is?

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}

Answer 2

Set "A" is said to be a subset of a set "B" if all elements of set "A" are also elements of set "B". It may be the case that both are the same set, or that "A" is a smaller set that "B".