Question

集合A*B={2,3,4,5}的所有子集的个数为?

Answer 1

16个子集空集、全集、{2}、{3}、{4}、{5}、{2,3}、{2,4}、{2,5}、{3,4}、{3,5}、{4,5}、{2,3,4}、{2,3,5}、{3,4,5}、{2,4,5}