Talk:Sum of Squares of Binomial Coefficients

Isn't this just a special case of the Chu-Vandermonde Identity?

It appears so. Feel free to add a proof along those lines on Sum of Squares of Binomial Coefficients/Proof 3 (simply copy e.g. the content of the Combinatorial Proof page and adapt the proof section). --Lord_Farin (talk) 13:32, 30 November 2012 (UTC)

I am so embarrassed. I originally crafted that great big mofo of an inductive proof by plodding through it step by step - I even used the C-V I in the induction step - then it's pointed out to me that using that same C-V I you can do it in one step ... --prime mover (talk) 20:08, 30 November 2012 (UTC)