Find the sum of n terms of each of the f...

Find the sum of n terms of each of the following
`1^(2) + ((1^(2) + 2^(2))/(2)) + ((1^(2) + 2^(2) + 3^(2))/(3))`+ …..

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The correct Answer is:

`(n)/(36) (4n^(2) + 15n + 17)`

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