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Re:看不懂解题报告。。。请哪位解释一下？。。。

Posted by Iambitious at 2007-04-28 17:14:16 on Problem 3219
In Reply To:Re:看不懂解题报告。。。请哪位解释一下？。。。 Posted by:KosonLau at 2007-04-28 17:09:12 
> 请问是什么原理,怎么证明??
c(m,n) = m!/n!/(m-n)!
分别求出m,n,m-n三个阶乘里面有多少个2，只要m!中2的个数多余n!中2的个数加上（m-n）!中2的个数，那么结果就是偶数
N & M是什么原理阿？同问
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