The sum of the first `n` terms of an A.P.is `3n+n^(2)` find "(1)" the first term "(2)" and the sum of the first two terms

If the sum of the first n terms of an A.P. is 4n-n^(2) what is the first term? What is the sum of the first two terms? What is the second term? Find the 3rd, 10th, and the nth terms.

If the sum of the first n terms of an AP is 4n-n^(2) ,what is the first term (that is )? What is the sum of first two terms? What is the second term? Similarly,find the 3rd, the 10th and the nth terms.

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

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 p terms of an A.P.is equal to the sum of the first q terms,then find the sum of the first (p+q) terms.

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

If the sum of the first n terms of an A.P. is 4n - n ^(2), what is the first term (that is S _(1) ) ? What is the sum of first two terms? What is the second term ? Similarly, find the 3 ^(rd), the 10^(th) and ten n ^(th) terms.

The sum of fIrst n terms of an A.P series is 26n-2n^2 . Find the fifth term.

If the sum of the first n terms of a G.P. = p and the sum of the first 2n terms = 3p, show that the sum of first 3n terms = 7p.