Class 11

Math

Algebra

Sequences and Series

The geometric mean between $−9$ and $−16$ is

- $12$
- $−12$
- $−13$
- none of these

Geometric mean between two numbers $a$ and $b$ is given by,

$GM=ab $

$∴$ $GM=(−9)(−16) =144 =±12$

$∵$ The geometric mean lies between $−9$ and $−16$ is

$∴$ GM $=−12$