... 聯集事件的機率求解. P(A OR B)= P(A U B) = P(A) + P(B) - P(A∩ B) 互斥 ... A交集B的機率為P(A and B) = P(A ∩ B) = P(A)*P(B|A) = P(B)*P(A|B)
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