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标题: GWD7-14,概率求助!!! [打印本页]

作者: beibeizhu 时间: 2005-9-11 13:37
标题: GWD7-14,概率求助!!!

请教解法,不胜感激了

Six cards numbered from 1 to 6 are placed in an empty bowl. First one card is drawn and then put back into the bowl; then a second card is drawn. If the cards are drawn at random and if the sum of the numbers on the cards is 8, what is the probability that one of the two cards drawn is numbered 5 ?

A. 1/6

B. 1/5

C. 1/3

D. 2/5

E. 2/3

作者: happyfish0517 时间: 2005-9-11 13:51
7-14 http://forum.chasedream.com/dispbbs.asp?BoardID=22&ID=91228

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