GWD数学疑难问题！

不甜

 Q14:
    

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

  Answer: A

        

 网上没搜到这道题，请牛牛帮助解答，谢谢！

mi2008

P38-330 =6

简单的可怕。。。

不甜

谢谢！