In a certain manufacturing process the probability of a type I defect is 0.21, the probability of a type II defect is 0.31, and the probability of having both types of defects is 0.01. Find the probability of having neither type of defect.

Answer 1

Hint:
Use P(A∪B)=P(A)+P(B)-P(A∩B)
and probability of having no defect is
1-P(A∪B).