标题: [求助]GWD11-14 [打印本页]

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作者: freesimens    时间: 2005-10-26 19:45     标题: [求助]GWD11-14

A company has assined a district 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

ANS:A

不好意思打擾大家了，我實在不知道該怎麼算，希望大家可以幫幫我，感激不盡囉.....

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作者: founder    时间: 2005-10-27 06:40

P(8,3)-330=6

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作者: freesimens    时间: 2005-10-27 18:18

謝謝囉....看來還真簡單...太糟糕了我....

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