__
ARITHMETICO - GEOMETRIC SERIES__

**Series- ak + (a+d)kr ^{ }
+ (a+2d) kr^{2}+....+
[a+(n-1)d]kr^{m}**

Here each term of the series has 2 parts, first part (black in color)
progresses in AP, whereas the second part progresses in GP. **a**
is the first term of AP part &** k** is the first term
of GP part. **d** is common difference and **
r **is common ratio.