(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Letl,m, andnbe positive integers withl[tex]\leq[/tex]mandl[tex]\leq[/tex]n. Prove the identity.

([tex]\stackrel{m + n}{l}[/tex]) = ([tex]\stackrel{m}{0}[/tex])([tex]\stackrel{n}{l}[/tex]) + ([tex]\stackrel{m}{1}[/tex])([tex]\stackrel{n}{l-1}[/tex])+...+([tex]\stackrel{m}{l}[/tex])([tex]\stackrel{n}{0}[/tex])

2. The attempt at a solution

I have no clue, I see proof and my brain goes dead. I thought I could just start writing the definition of the parts out on both sides and maybe something would make sense but it got messy quick and I didn't see any light at the end of that tunnel.

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# Homework Help: Binomial Proof

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