[求助]请好心人来帮帮忙啊,一道题怎么也解不出~~~

yangchen47

If the probability is 0.54 that Stock A will increase in value during the next month and the probability is 0.68 that Stock B will increase in value during the next month, what is the greatest possible value for the probability that neither of these two events will occur?

A. 0.22
B. 0.32
C. 0.37
D. 0.46
E. 0.63

susaphilogue

愚见：事件1是 Stock A will increase ,事件2是Stock B will increase,两者都不发生的最大可能概率，就是事件2发生事件1也必然发生，所以是（1-0.68）=0.32

两者都不发生的最小可能概率就是两个是独立事件