See , convert all the fractions to simple fractions, then the sum will be like :
S =(8/5)^2 + (12/5)^2+(16/5)^2.....
Take 16/25 (i.e. (4/5)^2) common then
25/16 * S = 4 + 9 + 16 .......+121
Calculate the sum on RHS as n (n+1)(2n+1)/6 where n = 11 and remember to subtract 1 from it as the series begins from 2^2,
You'll get 25/16*S = 505 and hence , S = 16/5 *101
For different values of n , you'll get different series , therefore for Vn , the series will have : first term =n and the common difference = 2n -1 , therefore
Vn = n^3 - (n^2/2 )+ n/2
Work out with this , and you'll be getting the answers to the comprehension as options B,D and B respectively.