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 , then its 19th term is

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 A.P.is 2n^(2)+3n then write its nth term.

If the sum of n terms of an A.P. is 2n^2+3n then write its nth 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 the sum of n terms of an A.P. is 2n^(2)+5n , then its n^(th) term

The sum of first n terms of an A.P. is 5n^(2) + 3n . If the nth term is 168, find the value of n. Also find the 20th term of the A.P.

The sum of first n terms of an A.P.is 5n-n^(2) . Find the nth term of this A.P.

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