一道GMAT数学DS题
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)\x09The probability that the ball will both be white and have an even number painted on it is 0.
2)\x09The probability that the ball will be white minus the probability that the ball will have an even number painted on it is 0.2.
求知问题翻译跟答案解析.