# Combinational Sum!!

Discrete Mathematics Level 3

Let, $$S=\{-50,-49,-48,\dots,0,1,2,\dots,49,50\}$$

$$A$$ is a set of products of any three elements of $$S$$. That mean $$A=\{x,y,z \in S : x\times y\times z\}$$.

Find $$\sum\limits_{i\in A} i$$

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