求助一道GWD

owen870930 · 发表于 2010-10-8 02:46:03

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
答案给的是C但是我算的是A，求解求过程~谢谢！

owen870930 · 发表于 2010-10-8 07:44:09

论坛设施 · 发表于 2010-10-8 07:54:58

C(20,5)/C(20,4) result is c

owen870930 · 发表于 2010-10-8 08:01:01

啊·明白了·thanks~

求助一道GWD

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