Find the number of sets \color{cyan}{(a_1,a_2,\ldots ,a_n)} such that \color{lime}{a_i\in \mathbb{Z}} and \color{lime}{0 \leq a_1 \leq a_2 \leq \cdots \leq a_n \leq m}
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Find the number of sets \color{cyan}{(a_1,a_2,\ldots ,a_n)} such that \color{lime}{a_i\in \mathbb{Z}} and \color{lime}{0 \leq a_1 \leq a_2 \leq \cdots \leq a_n \leq m}