#1**+1 **

a) C (5,3) = 10 subsets

b)

Total of subsets with no elements = 1

Total of subsets with one element = 5

Total of subsets with two elements =C (5,2) = 10

Total of subsets with three elements = C(5,3) = 10

So....we have 1 + 5 + 10 + 10 = 26 subsets with no more than three elements

CPhill Oct 28, 2019