Infinite Geometric Series focuses on finding the sum of an infinite geometric series
The rules of this chapter is that
If…
r is r<-1 or r>1, it has no answer as the graph is diverging which means that the sum is getting bigger in positive and negative ways.
In other case,
r is -1<r<1, it has sum but the graph gets smaller.
For example…
8 + 2 + 0.5 + 0.125 + …
The common ratio is
The formula used to find the answer is
S∞ =
So, the answer would be 10.666666666… as S∞ = 
In this chapter, it is very important to identify the range of the “r” value.