Latest Book Aptitude Question SOLUTION: it the sum of first n terms of A.P is cn^2,then the sum of squares of these n terms is (1)n(4n^2-1)/c^2/6 (2)n(4n^2+1)/c^2/3 (3)n(4n^2-1)/c^2/3 (4)n(4n^3+1)/c^2/6