It states that if a sample space S has N mutually exclusive events B, n=1,2,....,N, such that, B, OB, = {0} for m +n = 1,2,.., N, and any event A is defined on this sample space then the conditional probability of B, and A can be written as P(A|B,) P(B,) PSA|B)P(B)+ P(A|B2)P(B,)+……+P(A|By)P(By) (1.5 P(B, | A) =

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