Question

sejam A e B eventos tais que P(A) = 1/2, P(B) = 1/4 E P(A intersecção B) = 1/5. Calcular: a) P(A U B)

Answer 1

P(AUB)=P(A)+P(B)- P(A∩B)

P(AUB) =1/2 +1/4 -1/5 =2/4+1/4 -1/5 =3/4-1/5 =(15-4)/20 =11/20