Find the 15<sup>th</sup> term of the sequence 20, 15, 10 . . . . .

The 9<sup>th</sup> term of an A.P. is 449 and 449<sup>th</sup> term is 9. The term which is equa…

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

The common difference of the A.P. is $$\frac{1}{{2q}},$$ $$\frac{{1 - 2q}}{{2q}},$$  $$\frac{{1 - 4q}}{{2q}},$$…

What is the sum of the following series? -64, -66, -68, ......, -100

What is the sum of the first 12 terms of an arithmetic progression if the first term is -19 and last term is 36?

If the first term of an A.P. is a and nth term is b, then its common difference is

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