1.

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……. The sum V_(1)+V_(2)+….+V_(n) is

Answer»

`1/12 N(n+1)(3n^2-n+1)`
`1/12 n(n+1)(3n^2+n+2)`
`1/2 n(2n^2-n+1)`
`1/3 (2n^2-2n+3)`

ANSWER :B


Discussion

No Comment Found

Related InterviewSolutions