Question: if events a and b are mutually exclusive then =pa or b▼(choose one)?
Answer: Another word that means mutually exclusive is disjoint. If two events are disjoint, then the probability of them both occurring at the same time is 0. Disjoint: P(A and B) = 0. If two events are mutually exclusive, then the probability of either occurring is the sum of the probabilities of each occurring.