" 5.If the "n" th term of an "AP" is "(2n+1)" then the sum of its first three terms i "

If the nth term of an AP is (2n +1) then the sum of its first three terms is

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

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

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

If the 7^(th) term of n A.P is 40. Then the sum of its first 13 terms is

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

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 nth term of an A.P. is 4n-1 , find the 30th term and the sum of first 30 terms.

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.