The nth term of an A.P. is p, show that, the sum of its first (2n-1) terms is (2n-1)p.

If the nth term of a G.P. be p, then show that the product of its first (2n-1) terms is p^(2n-1) .

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

The nth term of an A.P. is p and the sum of its first n terms is q. Prove that its first term is (1)/(n)(2q-p n) .

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

If the nth term of an A.P. is t_(n) =3 -5n , then the sum of the first n terms is ………

If the sum of first m terms of an A.P is n and sum of first n terms of the same A.P is m, show that sum of first (m+n) terms of it is -(m+n) .

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.

The nth term of an A.P. is p and the sum of the first n term is s. Prove that the first term is (2s-pn)/(n)

The nth term of an A.P. is (5n-1). Find the sum of its 'n' terms.