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

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

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 AP is given by 2n^(2)+n, then find its nth term.

If the sum of n terms of A.P. is (1)/(2) (3n^(2) + 7n) , find its n^(th) term and write its 25th term.

The sum of n terms of an AP is 3n^2+5n ,then find its 16th term.

If sum of first n terms of an A.P is 2n^(2) + 7n, write its nth 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 first n terms of an A.P. is 3n^(2)-2n , then its 19th term is

The sum of the first n terms of an A.P.is 4n^(2)+2n. Find the nth term of this A.P.