What is the sum of the first 9 terms of an arithmetic progression if the first term is 7 and last term is 55?

The 3<sup>rd</sup> and 8<sup>th</sup> term of an arithmetic progression are -13 and 2 respective…

If S<sub>n</sub> denotes the sum of the first r terms of an A.P. Then, S<sub>3n</sub> : (S<su…

What is the sum of the first 13 terms of an arithmetic progression if the first term is -10 and last term is 26?

The sum of n terms of two A.P.’s are in the ratio 5n + 4 : 9n + 6. Then, the ratio of their 18<sup>th</su…

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

The 3<sup>rd</sup> and 6<sup>th</sup> term of an arithmetic progression are 13 and -5 respective…

If $$\frac{1}{{x + 2}},$$  $$\frac{1}{{x + 3}},$$  $$\frac{1}{{x + 5}}$$   are in A.P. then x…