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标题: 求一道GWD31套的数学题详解 [打印本页]

作者: shijianfeile 时间: 2011-11-15 06:58 标题: 求一道GWD31套的数学题详解

A certain club has 20 members.What is the ratio of the number of 5-member committees that can be formed from the members of the club to the number of 4-member committees that can be formed from the members of the club?（答案：16 to 5)

作者: socat123 时间: 2011-11-15 20:02

C5 20除以C4 20。排列。

作者: shijianfeile 时间: 2011-11-16 06:19

谢了...我理解错题意了。。。。

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