Question

Sendo n(A) = 28, n(B) = 20 e n(A ∩ B) = 9, calcule n(A U B).​

Answer 1

n(A∪B) = n(A) + n(B) - n(A∩B)

n(A∪B) = 28 + 20 - 9

n(A∪B) = 39

Bons estudos!