[" 26.The "n" th term of an "AP" is "(3+n)/(4)," then "],[" the sum of first "105" terms is "]

The nth term of an AP. Is (3+n)/(4) , then the sum of first 105 terms is

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

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 4n-1 , find the 30th term and the sum of first 30 terms.

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

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 sum of n terms of an A.P is (4n^(2)-3n)/(4) then ,n^(th) term of the A.P

The sum of the 4th and 8th terms of an AP is 24 and the sum of its 6th and 10th terms is 44. Find the first terms of the AP.

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