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what is conditional probability?
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conditional probability is the probability of a particular event happening, given that another event has already taken place. it is written as p(a|b), which reads as "the probability of event a given event b". for example, if you roll a dice, the probability of rolling a 6 is 1/6, or p(6) = 1/6. however, if you know the dice has already rolled a 5, then the conditional probability of it rolling a 6 is 0, or p(6|5) = 0.
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