求助PREP1的DS题，谢谢

阳光桂公主 · 发表于 2011-4-4 17:15:13

Each of the 25 balls in a certain box is either red, blue, or white and has a number from 1 to 10 painted on it. If one ball is
to be selected at random from the box, what is the probability that the ball selected will either be white or have an even
number painted on it?
(1) The probability that the ball will both be white and have an even number painted on it is 0.
(2) The probability that the ball will be white minus the probability that the ball will have an even number painted on it is
0.2.

阳光桂公主 · 发表于 2011-4-4 20:27:59

怎么没有人回答啊？？呜呜

阳光桂公主 · 发表于 2011-4-4 20:51:24

请问这道题有谁会吗？万分感谢！！！

求助PREP1的DS题，谢谢

所属分类: GMAT考试

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