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

The first three terms of an A.P. respectively are 3y – 1, 3y + 5 and 5y + 1. Then, y equals

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

Sum of n terms of the series $$\sqrt 2 $$  $$ + $$  $$\sqrt 8 $$  $$ + $$  $$\sqrt {…

If a + 1, 2a + 1, 4a - 1 are in A.P., then the value of a is:

The 2<sup>nd</sup> and 8<sup>th</sup> term of an arithmetic progression are 17 and -1 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 all 3 digit numbers that leave a remainder of '2' when divided by 3?