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【单选题】
设A、B为两随机事件,且B⊂A,则下列式子正确的是( )。
A.
P(A∪B)=P(B)
B.
P(AB)=P(B)
C.
P(B|A)=P(B)
D.
P(B-A)=P(B)-P(A)
E.
P(A∪B)=P(A)+P(B)
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