求助GWD 4 一道输血

sharonyyyy · 发表于 2011-9-12 14:55:40

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

请问这道题为什么选C？

sapphirezhang · 发表于 2011-9-12 15:05:22

挑5个成员和挑4个成员的ratio.
分子是c 20 5
分母是c 20 4
化简后得分子16，分母5
挑成员用c 组合。

sharonyyyy · 发表于 2011-9-12 19:35:44

哦哦明白了之前是没看懂题...谢谢

求助GWD 4 一道输血

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