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# Geometric Sequence

- A sequence with a constant ratio between successive terms
- The ratio tells us how to get from one term to another

- Each term is found by multiplying the previous term by a constant
- It's called a
*geometric*series because it is like increasing dimensions in geometry

## Formula

- $ar^{n - 1}$
- $a$ is the first term
- $r$ is the common ratio
- $n$ is the term you are looking for