If the 3<sup>rd</sup> and the 5<sup>th</sup> term of an arithmetic progression are 13 and 21, wh…

In an A.P., if d = -4, n = 7, a<sub>n</sub> = 4, then a is

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

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

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

The first and last terms of an A.P. are 1 and 11. If the sum of its terms is 36, then the number of terms will be

The common difference of the A.P. $$\frac{1}{3},$$ $$\frac{{1 - 3b}}{3},$$  $$\frac{{1 - 6b}}{3},$$   …

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