GRE数学练习题讲解：组合的计算

2022-06-04 08:50:10

　　新

　　Of the 700 members of a certain organization, 120 are lawyers. Two members of the organization will be selected at random. Which of the following is closest to the probability that neither of the members selected will be a lawyer?

　　A 0.5

　　B 0.6

　　C 0.7

　　D 0.8

　　E 0.9

　　这个就是组合的计算了，C580 2/C700 2 =0.68(约等于)，所以选C吧，这个题可以用下那个计算器了。

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