`" If the sum of 'n' terms of an A.P is "cn^(2)",then the sum of cubes of these n terms is "`

If the sum of first n terms of an AP is cn^(2) , then the sum of squares of these n terms 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 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 n terms of an A.P is cn (n-1)where c ne 0 then the sum of the squares of these terms is

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