集合A={1,2,3,4,5}则满足A∩B=B的集合B个数是
问题描述:
集合A={1,2,3,4,5}则满足A∩B=B的集合B个数是
答
集合A={1,2,3,4,5}则满足A∩B=B的集合B个数
=C(5,0)+C(5,1)+C(5,2)+C(5,3)+C(5,4)+C(5,5)
=(1+1)^5
=2^5
=32