If `S_n` the sum of first n terms of an AP is given by `2n^2+n`, then find its nth term.

If S_n , the sum of first n terms of an A.P., is given by S_n=5n^2+3n , then find its n^(t h) term.

If the sum of the first n terms of an A.P. is 1/2(3n^2+7n) , then find its nth term. Hence write its 20th term.

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

If the sum of n terms of an AP is given by S_(n) = (2n^(2)+3n) then find its common differnece.

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

The sum of first n terms of an AP is given by S_n=2n^2 + 3n . Find the common difference of the AP.

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

The sum of the first n terms of an A.P. is 4n^2+2n . Find the n t h term of this A.P.

The sum of first n terms of an A.P. is 3n^2+4n . Find the 25 t h term of this A.P.