Let A and B be two events of a random experiment. The probability that a second event (B) will occur if a first event (A) has already occured is called the conditional probability of B when A is given and is denoted by P(B/A).
• The conditional proabability is valid only when P(A) ≠ 0.
• Similarly, P(A/B) is the conditional probability of A when B is given.
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