Why 0!(fractorial)=1 ?

2010-03-20 5:59 am
如題
0!=1 係公式, 但係係點計出黎?

回答 (3)

2010-03-20 6:03 am
✔ 最佳答案
n! = 1x2x3x...x(n-2)(n-1)n
= n(n-1)!
Put n=1 in both side
we have,
1! = 1(1-1)!
0! = 1
參考: My Maths knowledge
2010-03-20 7:20 am
0!=1 is a definition, but not a result of calcuation.
This definition is to simply make calculation convenient.
2010-03-20 7:00 am


通常我地最早見到
factorial 係起 Maths 中的 排列 與 組合。



0! = 1,正好講出
冇野 亦係一種排列。Factorial 的定義,可參考 Wikipedia


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