Wednesday, 27 February 2019

summation - Having trouble understanding why $sum_{i=1}^ni^2= frac{n(n+1)(2n+1)}{6}$

So I understand $\sum\limits_{i=1}^{n}i^2 = \frac{n(n+1)(2n+1)}{6}$ but I'm not sure how to come to that conclusion. Having trouble understanding

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