Find sum(r=1)^n (1^3 + 2^3 + 3^3 + ………. ...

Find `sum_(r=1)^n (1^3 + 2^3 + 3^3 + ………. + r^3) / (r +1)^2`

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The correct Answer is:

`( n( n +1) ( 2n +1))/(24)`

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