If the `n^(th)` term of an AP be (2n-1) then the sum of its first n terms will be

If the n^(t h) term of an A.P. is (2n+1), find the sum of first n terms of the A.P.

If the n^(th) term of an A.P.is (2n+1), find the sum of first n terms of the A.P.

If n^(th) term of an A.P. is (2n + 1), what is the sum of its first three terms ?

The n^(th) term of an A.P is p and the sum of the first n terms is s. The first term is

If the n^(th) term of an A.P is (5n-2) ,find its first term

If the n^(th) term of an A.P is 2n-1 then sum to n terms of that A.P. is ........... .

The sum of first p terms of an A.P. is (p^(2))/(n) and the sum of its first q(!= p) terms is (q^(2))/(n) . Show that the sum of its first n terms will be n.

If the sum of first m terms of an A.P. is the same as the sum of its first n terms, show that the sum of its (m+n) terms is zero.

If the sum of first m terms of an A.P. is the same as the sum of its first n terms, show that the sum of its (m+n) terms is zero.

Find the sum of first n terms of an AP whose n^(th) term is 5-6n .find the sum of its first 20 terms