Final answer:
To find the probability when two events are not mutually exclusive, use the formula P(A or B) = P(A) + P(B) - P(A and B).
Step-by-step explanation:
When two events are not mutually exclusive, the formula to find the probability is:
P(A or B) = P(A) + P(B) - P(A and B)
This formula takes into account the probability of each individual event, as well as the probability of both events occurring together. In other words, you add the probabilities of each event separately, but then subtract the probability of both events happening at the same time to avoid double counting.