How can I find number of unordered non-negative integral solutions of the following equation
$$x_1 + x_2 + \ldots + x_r = n.$$
For example, the number of required solutions of $x_1 + x_2 = 3$ will be $2$, namely $(\{3,0\},\{1,2\})$.
I know how to find ordered integral solutions, but is there a way to find unordered solutions?
2026-04-22 01:33:49.1776821629
How to find number of unordered non negative integral solutions of the equation?
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