Question

n(AuB)=80 N (A)=55 e n (B)=60 determine N(A∩B)

Answer 1

n(AUB) = n(A) + n(B) - n(A∩B)

80 = 55 + 60 - n(A∩B)

80 = 115 - n(A∩B)

80 - 115 = - n(A∩B)

- 35 = - n(A∩B)

n(A∩B) = 35