Question

满足{1,2,3,}是M的子集,M是{1,2,3,4,5,6,}的集合个数是?A 8 B 7 C 6 D 5

Answer 1

a

{1,2,3}

{1,2,3,4}{1,2,3,5}{1,2,3,6}

{1,2,3,4,5}{1,2,3,4,6}{1,2,3,5,6}

{1,2,3,4,5,6}