What is the sum of the first 17 terms of an arithmetic progression if the first term is -20 and last term is 28?

The 7<sup>th</sup> and 21<sup>st</sup> terms of an AP are 6 and -22 respectively. Find the 26&lt…

In an AP, S<sub>p</sub> = q, S<sub>q</sub> = p and S denotes the sum of first r terms. Then, S&l…

The n<sup>th</sup> term of an A.P., the sum of whose n terms is S<sub>n</sub>, is

If the n<sup>th</sup> term of an A.P. is 2n + 1, then the sum of first n terms of the A.P. is

A bacteria gives birth to two new bacteria in each second and the life span of each bacteria is 5 seconds. The process o…

If S<sub>n</sub> denote the sum of n terms of an A.P. with first term a and common difference d such that $$…

The 3<sup>rd</sup> and 9<sup>th</sup> term of an arithmetic progression are -8 and 10 respective…