Let A and B be two sets such that n(A) = 5, n(B) = 3 and n(A ∩ B) = 2.
(i)n(A ???? B)
(ii) n(A × B)

Answer : (i) n(A ???? B) = n(A) + n(B) – n(A ∩ B)

= 5 + 3 – 2

=6

(ii) n(A × B) = n(A) × n(B)

= 5 × 3

= 15