# How do you find the common ratio of -3,6,-12,24,...?

Common ratio is $- 2$
Here we have the series $\left\{- 3 , 6 , - 12 , 24 , \ldots \ldots \ldots \ldots \ldots . .\right\}$
and hence common ratio is $\frac{6}{-} 3 = - \frac{12}{6} = \frac{24}{-} 12 = - 2$