How to find a number of solutions for $x_1+x_2+\ldots+x_n=r$ where $r$ is divisible by 3 and for a given $l$ and $r$ such that $l\leq x_i \leq r$?
2026-03-29 22:33:46.1774823626
How to find a number of solutions for $x_1+x_2+\ldots+x_n=r$ where $r$ is divisible by 3 and for a given $l$ and $r$ such that $l\leq x_i \leq r$?
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