# Common Ratio

The constant factor between consecutive terms of a
geometric sequence
is called the
**
common ratio.
**

**
Example:
**

Given the geometric sequence $2,4,8,16,\mathrm{...}$ .

To find the
**
common ratio
**
, find the ratio between a term and the term preceding it.

$r=\frac{4}{2}=2$

$2$
is the
**
common ratio.
**