| A. Definition
B. Finding the Sum of the First n Terms of a Geometric Sequence.
geometric series - the expression formed by adding the terms of a geometric sequence.
- Use Sn = [(1 - rn)/(1 - r)], Sn is the sum of the first n terms.
- Substitute the n, a, and r values into Sn = [(1 - rn)/(1 - r)].
- Simplify to find the sum.