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Re:终于将此公式理解了。。。。

Posted by frkstyc at 2008-06-30 23:42:52 on Problem 3604
In Reply To:终于将此公式理解了。。。。 Posted by:tangjiming at 2008-06-30 23:39:09
> 要是我早想到 
> \binom{k_i+2}{2}
> 即是1+2+3+。。。。+(k_i+1)就不至于想这么久了。。。。。。。。

跟这个有什么关系????

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