If the sum of first n terms of an AP 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) then the sum of squares of these n terms 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 first m terms of an A.P. is the same as the sum of its first n terms, show that the sum of tis (m+n) terms is zero.

If the sum of first m terms of an A.P. is the same as the sum of its first n terms, show that the sum of its (m+n) terms is zero.

If the sum of first m terms of an A.P. is the same as the sum of its first n terms, show that the sum of its (m+n) terms is zero.

The sum of first n terms of an A.P. is 5n-n^2 . Find the n t h term of this A.P.

If the sum of n terms of an A.P. is 2n^2+3n then write its nth term.

If the sum of first m terms of an A.P is n and sum of first n terms of the same A.P is m, show that sum of first (m+n) terms of it is -(m+n) .

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

If the sum of first n terms of an A.P. is an^(2) + bn and n^(th) term is An + B then