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Permutations and Combinations question

2016 · 9 Apr · Shift 1 · Q30
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  5. /2016 · 9 Apr · Shift 1 · Q30

Permutations and Combinations question

2016 · 9 Apr · Shift 1 · Q30

JEE MainMathematicsPermutations and CombinationsMCQ+4 / −1
The value of ∑r=115r2(15Cr15Cr−1)\sum\limits_{r = 1}^{15} {{r^2}} \left( {{{{}^{15}{C_r}} \over {{}^{15}{C_{r - 1}}}}} \right)r=1∑15​r2(15Cr−1​15Cr​​) is equal to :
  1. A
    560
  2. B
    680
  3. C
    1240
  4. D
    1085
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