Question

Given the following sets:

A = {2, 4, 6, 8, 10, 12, 14, 16, 18, 20}
B = {3, 6, 9, 12, 15, 18}
C = {4, 8, 12, 16, 20}
Find:
n (A)

Answer 1

n (A) = { 2,4,6,8,10,12,14,16,18,20}

n(A) = 10

I hope it helps