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arrow_back Find the sum of the first three terms of $ \sum_{r=1}^{n}\left(3 r^{2}+r-2\right)$

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\begin{aligned} &\text { Find the sum of the first three terms of } \sum_{r=1}^{n}\left(3 r^{2}+r-2\right) \text {. } \end{aligned}

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