Diketahui n(P) = 21, n(Q) = 30, dan n(P ∩ Q) = 10. Carilah nilai n(P ∪ Q)

Diketahui n(P) = 21, n(Q) = 30, dan n(P ∩ Q) = 10. Carilah nilai n(P ∪ Q)

Penyelesaian

n(P ∪ Q) = (21 – 10) + 10 + (30 – 10) = 11 + 10 + 20 = 41