Let $q,\ell, M \in \mathbb{N}$ How to get a better expression of the following sum: $$ \sum_{m=0}^q\binom{q-m+\ell-1}{q-m}\binom{2m+M-1}{2m} $$
2026-03-26 16:04:06.1774541046
Expression of a hypergeometric sum
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