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证明组合数都是整数

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hjfmhh Posted 2015-2-9 18:35 |Read mode

证明组合数都是整数

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爪机专用 Posted 2015-2-10 03:27

由实际意义可知，哼！

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其妙 Posted 2015-2-10 21:32

她说的是那些阶乘除以阶乘的结果是整数，强调用代数法，

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Author| hjfmhh Posted 2015-2-10 21:43

是的，有方法吗

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test Posted 2015-2-10 22:56

代数？那就数归嘛

利用杨辉三角，由上面是整数自然推出下面的都是正数[得意]

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isee Posted 2015-2-12 10:15

回复 4# hjfmhh

有，涉及的知识更多。

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isee Posted 2015-2-12 10:19

转载，原作者详。

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