题目

The probability that a certain event will occur is x.

The probability that the event will not occur is y.

Quantity A

x+y

Quantity B

1

选项

A.

Quantity A is greater.


B.

Quantity B is greater.


C.

The two quantities are equal.


D.

The relationship cannot be determined from the information given.


解析

答案是C。 对于任意一个事件,它要么发生(概率为x),要么不发生(概率为y),不存在其他情况。因此,x + y 的值始终为1。
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