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

For an A.P. if a<sub>25</sub> - a<sub>20</sub> = 45, then d equals to:

The common difference of an A.P., the sum of whose n terms is S<sub>n</sub>, is

What is the sum of all positive integers up to 1000, which are divisible by 5 and are not divisible by 2?

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 2<sup>nd</sup> and 8<sup>th</sup> term of an arithmetic progression are 17 and -1 respective…

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

15<sup>th</sup> term of A.P., x - 7, x - 2, x + 3, ........ is