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Why did you use the formula n(n+1)(2n+1) / 6 ?

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related to an answer for: Mathmatical induction 1
asked Dec 16, 2015 in PRECALCULUS by anonymous
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The formula image is not used in the solution.

Let me know what exactly your doubt is ?

commented Dec 17, 2015 by Lucy Mentor
edited Dec 17, 2015 by Lucy

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