数学问题

缺氧 · 发表于 2011-1-22 19:33:46

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
答案学C，但不晓得为什么

sdcar2010 · 发表于 2011-1-23 03:02:01

ratio = 20*19*18*17*16/20*19*18*17 = 16

sdcar2010 · 发表于 2011-1-23 03:02:12

What is the ratio of the ~~member~~ number of 5-member . . .

缺氧 · 发表于 2011-1-24 00:33:12

什么意思啊？还是不懂，求解。。谢谢

缺氧 · 发表于 2011-1-24 23:07:54

没人知道吗？顶起来。。。

jaze · 发表于 2011-1-24 23:16:47

c(5, 20) / c(4, 20)

缺氧 · 发表于 2011-1-24 23:51:48

谢谢，懂了

数学问题

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