The first and last term of an A.P. are a and l respectively. If S is the sum of all the terms of the A.P. and the common…

If the sum of it terms of an A.P. is 2n<sup>2</sup> + 5n, then its nth term is

What is the sum of the first 12 terms of an arithmetic progression if the 3<sup>rd</sup> term is -13 and the…

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

How many terms are there in the GP 5, 20, 80, 320........... 20480?

The number of terms of the A.P. 3, 7, 11, 15, ....... to be taken so that the sum is 406 is

The sum of the first 16 terms of an AP whose first term and third term are 5 and 15 respectively is

The 3<sup>rd</sup> and 7<sup>th</sup> term of an arithmetic progression are -9 and 11 respective…