# How do you use the geometric sequence of numbers 1, 2, 4, 8,…to find r, the ratio between 2 consecutive terms?

$r = 2$
The common ratio for a geometric sequence $\left({x}_{n}\right)$ is defined as $r = {x}_{n + 1} / {x}_{n}$.
So in this case, $r = \frac{8}{4} = \frac{4}{2} = \frac{2}{1} = 2$