[問題]GWD11-14

[Shawn1983]

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

不太懂題目的意思
麻煩大家幫我解答一下了 多謝

[scujean]

要用2,3,4,5, 6, 7, 8, 9這幾個數字來做code,此code要求是由3個不同數字組成
但是小心題目最後問的是，有多少codes是分給330個人後剩下的
做法：8C3*[3!]=336 ,336-330=6