Vandemonde's Identity

Explanations 1

• Vandermonde's Identity Let m,n,r∈N0m,n,r \in \mathbb{N}_0m,n,r∈N0​. Then: (m+nr)=∑k=0r(mk)(nr−k).\dbinom {m+n}{r} = \displaystyle\sum_{k=0}^{r} \dbinom {m}{k} \dbinom {n}{r-k}.(…

  By Ahaan Rungta