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[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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