国际顶尖MBA申请交流平台--TOPWAY MBA

标题: TT1-36 [打印本页]

作者: alexmingzhu 时间: 2006-10-8 06:34 标题: TT1-36

Each signal that a certain ship can make is comprised of 3 different flags hanging vertically in a particular order. How many unique signals can be made by using 4 different flags?

A. 10

B. 12

C. 20

D. 24

E. 36

我选12,答案24. 牛人指导一下.

作者: luolihua73 时间: 2006-10-8 13:06

要考虑不同的排列顺序，所以是A(3,4)=24

作者: lewis 时间: 2006-10-12 19:12

agree!!!!!

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