if a b c and d are the only possible outcomes of a random event , then P(A)+P(B)+P(C)=1
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event F has occurred, written as P (E | F), is given by. P(E F) ... 1 n i i p. = ∑ . 13.1.9 Mean and Variance of a Random Variable. Let X be a ... If the probability that exactly one of A, B occurs is q, then prove that.
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