Let Vr denote the sum of first r terms of an arithmetic progression (A.P.) whose first term is r and the common difference is (2r – 1).
Let `T_(r)=V_(r+1)-V_(r)-2 and Q_(r+1)-T_(r)` for `r=1,2…….`

1. The sum `V_(1)+V_(2)+….+V_(n)` is
A. `(1)/(12) n(n+1)(3n^2-n+1)`
B. `(1)/(12)n(n+1)(3n^2+n+2)`
C. `(1)/(2)n(2n^2-n+1)`
D. `(1)/(2)(2n^3-2n+3)`.

2. Let `T_r=V_(r+1)-V_r-2` and `Q_r =T_(r+1)-T_r` for `r=1,2` `T_r` is always
(A) an odd number
(B) an even number
(C) a prime number
(D) a composite number