Wikipedia 10K Redux by Reagle from Starling archive. Bugs abound!!!

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Conditional probability is the probability that some event A happends knowing that event B took place. It is written P[A|B]. Here is how to compute it: P[A|B] = P[A and B] / P[B] If A and B are independant, then P[A and B] = P[A]P[B].