Question

If the sum to n terms of an A.P is cn(n–1); c ≠ 0, then the sum of squares of these terms is

(a) c²n² (n + 1)²

(b) \(\frac{2c^2}{3}n(n -1)(2n -1)\)

(c) \(\frac{2c^2}{3}n(n +1)(2n +1)\)

(d) None of these

Answer 1

Correct option is (b) \(\frac{2c^2}{3}n(n -1)(2n -1)\)