Unifor-CE) Indica-se por n(X) o número de elementos
do conjunto X. Se A e B são conjuntos tais que n(A U B)
= 24, n(A – B) = 13 e n(B – A) = 9, então:
a) n(A U B) – n(A ∩ B) = 20
b) n(A) – n(B) = n(A – B)
c) n(A ∩ B) = 3
d) n(B) = 11
e) n(A) = 16
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