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371、
【emagic】一个事件只有3种可能性,概率分别是P(A),P(B),P(C),则P(A)是不是大于P(B)+P(C)? (1)   (B)=0.65-P(C) (2)P(B)=P(C) 答: A 参考答案:
A
条件一:充分 可得P(A)=0.35 必然小于P(B)+P(C)
条件二:明显不充分
personally think the correct answer is D.
For (2). Because there are only three PB in one event,so every event has the fraction of PB, it means that none of PB is above 1,because 1=Pa+Pb+Pc, and through (2), Pa=1-2Pb, it compared with 2Pb. Because every PB is less than 1,so it can denfinently get 1-2Pb<2Pb,and so Pa< b+Pc
Does anyone think in my way or you have the better solution??Please!!!!!!!!!! |
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