If the sum of n terms of an A.P is cn (n-1)where `c ne 0` then the sum of the squares of these terms is

The sum of n terms of an A.P.is an (n-1). Find the sum of the squares of these terms.

If the sum of first n terms of an A.P is cn^(2) and the sum of squares of these n terms is (n(pn^(2)-1)c^(2))/(s) then the value of (s)/(p) is

If the sum of first n terms of an AP is cn^(2) , then the sum of squares of these n terms is

the sum of the n terms of A.P. is 4n(n-1) then the sum of their squares is:

In the sum of first n terms of an A.P.is cn^(2), then the sum of squares of these n terms is

If the sum of n terms of an A.P is 2n+3n^(2) , find the r^(th) term

The sum of three consecutive terms of an A.P. is 21 and the sum of the squares of these terms is 165.Then product of the three terms is