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SACE Stage 2 Specialist Mathematics Practice Questions - SACE Stage 2 Specialist Mathematics Examination (South Australia) Exam

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Using the sum of squares formula $\sum_{r=1}^n r^2 = \frac{n(n+1)(2n+1)}{6}$, what is the exact value of $S_3 = 1^2 + 2^2 + 3^2$?
Correct Answer:
14

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