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Mutually exclusive events


When two events are mutually exclusive, it means that both events cannot happen at the same time. For instance, getting a six on a die and getting a four on a die. In order to find the probability of one event occurring OR another event occurring (where the events are mutually exclusive), we add the probabilities together.

P(A or B) = P(A) + P(B)

Otherwise, P(A or B) = P(A ⋃ B) = P(A) + P(B) – P(A ⋂ B)

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