Mutually Exclusive events If event A and event B cannot occur jointly (simultaneously), P(A and B) = 0, and A and B are called mutually exclusive events. For this question, let the sample space contain gender Male or Female, and choose the statements which are true. P(Male and Female) < 0; P(Male and Female) > 0, or possible; P(Male or Female) = 1, or certain; P(Male and Female) = 0, or impossible; or P(Mae or Female = 0, or impossible