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请教高手。。3个GWD问题不懂。。
Q22:
If –2x > 3y, is x negative?
(1)y > 0
(2)2x + 5y – 20 = 0
（1易看出是可以的，为什么2也可以呢？）
Q32:
What is the probability that event E or event F or both will occur?
(1)The probability that event E will occur is 0.6.
(2)The probability that event F will occur is 0.4.
（答案是E。。但是，不是可以由1-0.4X0.6，也就是1-E与F都不发生的几率，为什么不选C呢？）
QX:
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
此题怎么算出B答案呢
谢谢各位了
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