[Q. ]PP1-PS-94
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 be0. How many different identification numbers
are possible?
我算C9取1xC10取1xC10取1xC10取1=9000
可是答案是4536......
到底是我有那邊搞錯還是答案是錯的=_=
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