Find the first term of an AP whose 8<sup>th</sup> and 12<sup>th</sup> terms are respectively 39 …

If 18, a, b - 3 are in A.P. then a + b =

If 7 times the seventh term of an Arithmetic Progression (AP) is equal to 11 times its eleventh term, then the 18<sup…

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

How many terms are there in 20, 25, 30 . . . . . . 140?

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

What is the sum of all 3 digit numbers that leave a remainder of '2' when divided by 3?