If \( \sum_{r=1}^{n} r=78 \), then \( \sum_{r=1}^{n} r^{2} \) is eq...
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If \( \sum_{r=1}^{n} r=78 \), then \( \sum_{r=1}^{n} r^{2} \) is equal to
\( \mathrm{P} \)
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