how to proof (转载)# Programming - 葵花宝典
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【 以下文字转载自 Mathematics 讨论区 】
发信人: lanti (Ice+cream+inside), 信区: Mathematics
标 题: how to proof
发信站: BBS 未名空间站 (Wed Apr 2 10:38:31 2008)
(n choose 2) + (n+1 choose 2) = n^2
using combinatorial argument
发信人: lanti (Ice+cream+inside), 信区: Mathematics
标 题: how to proof
发信站: BBS 未名空间站 (Wed Apr 2 10:38:31 2008)
(n choose 2) + (n+1 choose 2) = n^2
using combinatorial argument
