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标题: OG第152页 数学set2的第10题 [打印本页]

作者: julia27    时间: 2017-7-4 23:00
标题: OG第152页 数学set2的第10题
Of the 700 members of a certain organization, 120 are lawyers. Twomembers of the organization will be selected at random. Which of thefollowing is closest to the probability that neither of the members selectedwill be a lawyer?
这道题,答案用的思路都是:在不是律师的人中选。比如其中一个解法:(580/700)(579/699)=0.6863
而我的思路是1-至少其中一人是,于是就有:120/700=0.1714,119/699=0.1702,1 - 120/700 - 119/699 = 0.6584
我的思路对吗?

作者: yume1491    时间: 2017-9-5 07:17
Your probabilities aren't independent!




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