[" 4.The sum of the first "n" terms of an "AP" is "(3n^(2)+6n)" .Find the nth term and "],[" the "15" th term of this AP."]

(i) The sum of the first n terms of an AP is ((5n^(2))/(2) + (3n)/(2)) . Find the nth term and the 20th term of this AP. (ii) The sum of the first n terms of an AP is ((3n^(2))/(2) + (5n)/(2)). Find its nth term and the 25th term.

The sum of the first n terms of an A.P. is 3n^2+6n . Find the n t h term of this A.P.

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

The sum of the first n terms of an A.P. is 3n^2+6n . Find the n^(th) term of this A.P.

The sum of first n terms of an AP is (3n^2+6n) Find the n^(th) term and 15^(th) terms of the AP

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

The sum of first n terms of an AP is 4n^(2)+2n Find its n th term.

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

The sum of first n terms of an AP is (5n - n^(2)). The nth term of the AP is

The sum of n terms of an A.P. is n^(2) + 3n . Find its 20th term.