Question

Ignore my answers but help

Answer 1

n(A) = 5 + 7 =12

n(B) = 7 + 3 = 10

n(A n B) = 7

n(A u B) = n(A) + n(B) - n(A n B)

5 + 3 - 7 = 1

n(A')=3

n(B')=5