Is there is a proof of Vandermonde's identity by induction over $r$ ?
I have read the proof by induction, but its over $n$ not $r$ ...
Vandermonde's identity:
$${n \choose r} = \sum_{i=0}^{r}{ {{t}\choose{i}} { {n-t} \choose {r-i} } }$$
2026-04-12 09:31:43.1775986303
Vandermonde's identity induction
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