Let $0\leq x\leq i\leq y\leq n$, where $n \in N$. Find an upper bound of the sum $$ \sum_{i=x}^y{i+x-1 \choose x-1}{n+y-i \choose y-i} $$
2026-04-06 22:12:32.1775513552
Upper bound on the sum with binomial coefficients
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