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标题: Help TT 10-14 [打印本页]

作者: plbl1510 时间: 2006-9-8 07:42
标题: Help TT 10-14

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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

作者: merryqing2004 时间: 2006-9-8 07:45

＝ P（8，3）－330

＝8×7×6－330

＝6

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