addition law

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If A and B are two events then the addition law states that the Pr(A or B)=Pr(A)+Pr(B)−Pr(A and B), or using set notation P(AB)=P(A)+P(B)−P(AB). In the special case where A and B are mutually exclusive events this reduces to P(AB)=P(A)+P(B).

Subjects: Probability and Statistics.

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