Prep-T1-PS-94

[lucyyeh]

94. 10331-!-item-!-187;#058&007190
A company plans to assign identification numbers to its employees. Each number is to consist of four different digits from 0 to 9, inclusive, except that the first digit cannot be 0. How many different identification numbers are possible?

(A) 3,024
(B) 4,536
(C) 5,040
(D) 9,000
(E) 10,000

ANS: C

這一題不是9x10x10x10嗎?

[lisayang83]

四個數字 要不一樣 且第一個數次非零
但是我算出來是 9*9*8*7 = 4536
也不對

[austi_co]

小弟也想不出來
算半天的答案也是4,536

[lucyyeh]

對不起大家，我題目沒看清楚答案又打錯，答案是B

[austi_co]

小弟昨天晚上睡覺還在想...
還特別列了一張表來看

本來想要跟樓主說...答案是不是有錯說

感謝樓主的賜告...謝謝