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标题: gwd-11-14 [打印本页]

作者: sisxoinouer 时间: 2008-3-19 16:00 标题: gwd-11-14

Q14:

A company has assigned a distinct 3-digit code number to each of its 330 employees. Each code number was formed from the digits

2, 3, 4, 5, 6, 7, 8, 9

and no digit appears more than once in any one code number. How many unassigned code numbers are there?

A. 6

B. 58

C. 174

D. 182

E. 399

请问这道题如何求解阿？谢谢！

作者: dream_piggy 时间: 2008-3-20 06:58

(8,3)-330=6

你自己再琢磨一下为什么。

作者: sisxoinouer 时间: 2008-3-21 12:51

谢谢，忘了这些数是有顺序的了.

作者: bastencools 时间: 2008-6-1 07:50

6

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