Question

Given U=0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A=0, 2, 4, 6, 8, and B=1, 3, 5, 7 find n(A)

Answer 1

n(A) can also be known as cardinal number or the total number of elements in A

n(A) = 5