Question

Considere 3 conjuntos A, B e C, tais que: n(A) = 28, n(B) = 21, n(C) = 20, n(A∩B) = 8, n(B∩C) = 9, n(A∩B∩C) = 3. Assim sendo, o valor de [n(A∪B)∩C] é:
a) 3
b) 10
c) 20
d) 21
e) 24

Answer 1

[(A∪B)∩C] = (A∩C) ∪ (B∩C) = (A∩C) + (B∩C) - (A∩B∩C) = 4 + 9 - 3 = ⇒ 10

Letra (b) = 10