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终于将此公式理解了。。。。

Posted by tangjiming at 2008-06-30 23:39:09 on Problem 3604 and last updated at 2008-06-30 23:40:08
In Reply To:Re:这题有解题报告没 Posted by:frkstyc at 2008-06-30 08:51:50
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。。。。。。。。

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