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标题: TTGWD4-5 [打印本页]

作者: amyding85 时间: 2006-9-2 17:23
标题: TTGWD4-5

Q5:

A certain club has 20 members. What is the ratio of the member 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?

A. 16 to 1

B. 15 to 1

C. 16 to 5

D. 15 to 6

E. 5 to 4

Answer: C

这道题不是这样做么：c20里选5除以c20里选4

，怎么算不对呢？

作者: amyding85 时间: 2006-9-2 18:08

鼎by myself

作者: 吉吉狗 时间: 2006-9-2 21:00
你的思路对呀，这样算出来就是C

作者: zyj1203 时间: 2008-5-11 21:35

C(5,20)/C(4,20)=16/5

作者: 52element 时间: 2008-8-29 10:39
怎么会算出来c阿。。。

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