Sum of first n terms of an A.P. is of the form `An^2 + Bn` i.e. aquadratic expression in n, in such case the common differenceis twice the coefficient of `n^2`. i.e. 2A

Show that the sequence is an A.P. if its nth term is linear expression in n and in such a case the common difference is equal to the coefficient of ndot

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

(vi)A sequence is an AP if the sum of its first n terms is of the form An^(2)+Bn where A and B are constants independent of n. In such a case the common difference is 2A

If sum of first n terms of an A.P is 2n^(2) + 7n, write its nth term.

The sum of n terms of an A.P is n^2 .Find the common difference.

The sum of first n terms of an A.P. is 5n ^(2)+ 4n, its common difference is :

The sum of first n terms of an A.P. is 5n ^(2)+ 4n, its common difference is :

If the sum of first n terms of an A.P. is 3n^(2)-2n , then its 19th term is

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