$\"\"$ \ \

The series is $\"\"$ . \ \

Divergence test: \ \

If $\"\"$ does not exist or if $\"\"$ , then the series $\"\"$ is divergent.

Find $\"\"$ . \ \

$\"\"$ \ \

Let $\"\"$ . \ \

As $\"\"$ then $\"\"$ . \ \

$\"\"$ \ \

$\"\"$ . \ \

Therefore by the divergence test series is divergent. \ \

$\"\"$

$\"\"$ is divergent.