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 the first n terms of an AP is given by S_n=3n^2-n then find its nth terms, first term and common difference

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 s_(n) the sum of first n terms of an A.P, is given by s_(n)=5n^(2)+3n, then find its n^(th) terms.

If S_(n) the sum of first n terms of an A.P. is given by Sn = 3n^(2) - 4n , find the 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 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 n terms of an A.P. is given by S_(n) =(3n^(2)+2n) , find its n^(th) term.

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

If sum of first n terms of an AP is 2n^(2)+5n. Then find S_(20)