求此道prep题的详解！

500023 · 发表于 2010-3-4 09:00:14

each of the 25balls in a certain box is either red ,blue or white and has a number from 1 to10 painted on it. if one ball is slected at ramdom from box, what is probablity that the ball selected will either be white or have a even number painted on it?

(1 the probablity that the ball will both be white and have a even number painted on it is 0.
2) the probablity that the ball will be white minus the probablity that the ball will have a even number painted on it is 0.2.

500023 · 发表于 2010-3-4 09:01:59

不好意思，传的是图片，所以看不清楚，麻烦各位NN，把图片拖出来单独成一页面，就可以看清了！

kingapple25 · 发表于 2010-3-4 10:48:17

拖出来也打不开，lz最好重新上传一下~

求此道prep题的详解！

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