The value of 15 15 2 r 15 r 1 r 1 C r = C – æ ö ç ÷ ç ÷ è ø å is equal to :

Question:
\text { The value of } \sum_{r=1}^{15} r^{2}\left(\frac{{ }^{15} C_{r}}{{ }^{15} C_{r-1}}\right) \text { is equal to: }

Correct Option: 4

JEE Main Previous Year 1 Question of JEE Main from Mathematics Permutations And Combinations chapter.

JEE Main Previous Year Online April 9, 2016

Solution: