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The value of $\sum \limits_{r=1}^{15} r^2 \bigg( \large\frac{^{15} C_r}{^{15}C_{r-1}}\bigg)$ is equal to :

$\begin{array}{1 1} (1) 560 \\ (2) 680 \\ (3) 1240 \\ (4) 1085 \end{array} $

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