$\"\"$

The series is $\"\"$ .

Divergence test :For the series $\"\"$ , If $\"\"$ , then the series $\"\"$ is divergent.

Here $\"\"$ .

Find $\"\"$

$\"\"$

If $\"\"$

$\"\"$

Since $\"\"$ , then the series $\"\"$ is divergent.

$\"\"$

The series is divergent.