涛涛4-5

lifechaser

请教一下这题，好像没有看到讨论。。。

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

难道不是4/5吗???

Jeffxf

C.16 to 5

Solution:

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

钟小免

第一个member打错了，应该是member

钟小免

不不不 我想说是number