请问这道题为什么不选b
问题如下图：
选项：
A. 
B. 
C. 
解释：
NO.PZ2017092702000066问题如下Whiof the following best scribes how analyst woulestimate the expectevalue of a firm unr the scenarios of bankruptansurvivorship? The analyst wouluse:A.the aition rule. B.contionexpectevalues. C.the totprobability rule for expectevalue. C is correct.The totprobability rule for expectevalue is useto estimate expectevalue baseon mutually exclusive anexhaustive scenarios.本题涉及如果未来只有破产和不破产这两种情况下，如何计算公司的expectevalue。那么全概率公式来解决就即可。 请分别下a和为啥错
NO.PZ2017092702000066 问题如下 Whiof the following best scribes how analyst woulestimate the expectevalue of a firm unr the scenarios of bankruptansurvivorship? The analyst wouluse: A.the aition rule. B.contionexpectevalues. C.the totprobability rule for expectevalue. C is correct.The totprobability rule for expectevalue is useto estimate expectevalue baseon mutually exclusive anexhaustive scenarios.本题涉及如果未来只有破产和不破产这两种情况下，如何计算公司的expectevalue。那么全概率公式来解决就即可。 我一开始选b是因为我以为surviorship是破产情况下能留存下来的可能，意思是surviorship和破产两个mutually exclusive吗
NO.PZ2017092702000066 我记得有道题是根据下一年市场好/坏/均衡，来算预期的点位。用的就是加法法则。这道题是预期的破产/继续运行，两种概率，为什么就不能用加法法则了呢老师？
contionexpectevalues. the totprobability rule for expectevalue. C is correct. The totprobability rule for expectevalue is useto estimate expectevalue baseon mutually exclusive anexhaustive scenarios.请问全概率公式在讲义的哪里呀 谢谢
没读懂题目跟答案…可以翻译讲解一下吗
