单选题
Let A and B be two mutually exclusive events with P(A) =0.40 and P(B)=0.20. Therefore :
A、
A. P(B|A)=0.20.
B、
B. P(A and B)=0.
C、
C. P(A or B)=0.52.
【正确答案】
B
【答案解析】
If the two evens are mutually exclusive, the probability of both ocurring is zero.
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