[問題]GWD 11-14

[jamescheng]

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

answer:a
請問這提的問題是問啥，謝謝•

[micki]

問題是問: 有多少個號碼是沒有被分配到的.

總共會有 8*7*6=336 個號碼 只有330個人

336-330 = 6

[Flory]

對不起, 我理解力不好. 可否告知why 8*7*6呢?

謝謝喔!

[yuying]

總共有8個數, 第一位8個數都可以, 但因為數字不能重複, 所以第二位只剩7個數, 第三位剩下6個囉~