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一蒙就对 · 2019年08月21日

问一道题：NO.PZ2015120604000067 [ CFA I ]

  1. CFA I
  2. Quantitative

老师，我知道P（a|b）和P（ab）都得零，但是C咱们随便假设一下，如果说P（a）=0.3 P（b）=0.2 两个数一算最后也不得零啊 为什么选C呢？问题如下图：

选项：

A.

B.

C.

解释：

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1 个答案

Olive_品职助教 · 2019年08月21日

同学你好，你这个“两个数一算最后也不得0”是怎么算的？C选项也没说等于0呀，C选项说的是P（A orB）=P（A）+P（B）。加油哦

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NO.PZ2015120604000067 解析中说到In this case, P(A/B)=0, because event A anB are mutually exclusive. P(A/B)为什么不是等于P(A)+P(B)?

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