设有A、B两个集合
如果A、B互不相容,
则A∩B=Φ,P(A∩B)= 0,P(B│A)= P(A│B)=0
如果A、B相互独立,
则 P(A∩B)= P(A)P(B),P(B│A)= P(B), P(A│B)=P(A)
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