Question

1+4+9+...n2 find out the sum ​

Answer 1

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= 5+9+n2

= 14+n2

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Answer 2

sum of n natural numbers

${1}^{2} + {2}^{2} ... + {n}^{2} = \frac{n(n + 1)(2n + 1)}{6}$

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