Mathematics · 2016
JEE Main · 9 April 2016, Shift 1 · Q69
The value of Σ_r=1^15 r^2((^15 C_r)/(^15 C_r-1)) is equal to:
The value of $\displaystyle \sum_{r=1}^{15} r^2\left(\frac{{ }^{15} \mathrm{C}_r}{{ }^{15} \mathrm{C}_{r-1}}\right)$ is equal to :
Official answer
(2)
$\displaystyle 680$
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JEE Main 2016 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.