If`t_(2)=2` and `t_(7)=22` then the sum of first 35terms of an A.P is

The sum of first 16 terms of the A.P.: 10,6,2,… is :

The sum of first 16 terms of the A.P.: 10,6,2,... Is

Find the sum of the first 10 terms of the A.P. 6,4,2,…..

If sum of first 20 terms of an A.P. is equal to sum of first 30 terms of the A.P. then sum of the first 50 terms of the A.P. is

Find the sum of the first 22 terms of the AP: 8,3,-2,...

The sum of the first five terms of an A.P. and the sum of the first seven terms of the same A.P. is 167. If the sum of first 10 terms of this A.P. is 235, find the sum of its first twenty terms.

If the sum of the first four terms of an AP is 40 and the sum of the first fourteen terms of an AP is 280. Find the sum of first n terms of the A.P.

Let {t_(n)} is an A.P If t_(1) = 20 , t_(p) = q , t_(q) = p , find the value of m such that sum of the first m terms of the A.P is zero .

An A.P. consist of even number of terms 2n having middle terms equal to 1 and 7 respectively. If n is the maximum value which satisfy t_(1)t_(2n)+713 ge 0 , then the value of the first term of the series is