一概率题

stellat0510 · 发表于 2010-8-31 11:47:36

If the probability is0.54 that Stock A will increase in value, 0.68 that Stock B will increase, Whatis the greatest possible value for the probability that neither of these twoevens will occur?

tha answer is 0.32

how to solve this? Many thanks!!

Leliolevine · 发表于 2010-8-31 11:52:47

A和B都不会升值，既A并B的补集。A并B补=1-A-B+A交B 最大的可能性是A交B=A=0.54 1-0.54-0.68+0.54=0.32

stellat0510 · 发表于 2010-8-31 11:53:32

多谢！

一概率题

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