中五附加數學(請教)

2009-10-30 1:32 am
1: (n-1)! / (n-2)!

回答 (2)

2009-10-30 1:51 am
✔ 最佳答案
As follows:


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2009-10-30 1:48 am
答案是 n - 1.
如 (5-1)!/(5-2)! = 4!/3!=4.



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