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Let Vr denote the sum of first r terms o...

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

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