 蓝冰晶（我是叔控） 
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1 楼：
智商跟不上，寻求帮助
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13年08月25日14点01分 |
尼玛的数学概率题惊呆我了好吗……
Suppose that we have 4 boxes A, B, C, D.
•Box A contains 6 white balls, 3 red balls and 1 black ball. .
•Box B contains 4 white balls and 6 red balls. .
•Box C contains 8 white balls and 2 red balls. .
•Box D is empty..
We will place 1 ball in D according to the following procedure.
•Choose a ball at random from A. .
•If the ball chosen from A is white, then choose a ball at random from B and place it in D. .
•If the ball chosen from A is red, then choose a ball at random from C and place it in D. .
•If the ball chosen from A is black, then choose one of the boxes B or C at random, choose a ball at random from that box and place it in D.
Suppose that we know that the ball placed in D was red. What is the probability that the first ball chosen from A was white?
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