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$\begin{align*}\frac{\frac{1}{2}. \frac{2}{2}}{1^3} + \frac{\frac{2}{2}. \frac{3}{2}}{1^3+2^3} + \frac{\frac{3}{2}.\frac{4}{2}}{1^3+2^3+3^3}+...+n \end{align*}$ terms :


( A ) $\frac{n+1}{n}$
( B ) $\frac{n}{n+1}$
( C ) $\frac{n+1}{n+2}$
( D ) $\frac{n-1}{n}$

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