Question: If A and B are two events on a sample space such that P(A) 0, P(B) 0, then we have P(A|B)P(B|A) = 1.

If A and B are two events on a sample space such that P(A) ≠ 0, P(B) ≠ 0, then we have P(A|B)P(B|A) = 1.

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