Question: p(a b) when a and b are mutually exclusive?
Answer: Two events are mutually exclusive or disjoint if they cannot occur at the same time. ... The probability that Events A and B both occur is the probability of the intersection of A and B. The probability of the intersection of Events A and B is denoted by P(A ∩ B). If Events A and B are mutually exclusive, P(A ∩ B)