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？
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发表于 2017-7-4 23:00:54
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