conditional probability

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con·di·tion·al prob·a·bil·i·ty

a probability quoted when the range of choices admitted is restricted, that is, conditional; thus, the probability of the child of a color-blind man inheriting the gene is 1/2 if the child is female and almost 0 if the child is male.

conditional probability

the probability that event A occurs, given that event B has occurred. Written P(AB).
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