$\"\"$

The series $\"\"$ .

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

Here $\"\"$ .

Find $\"\"$

$\"\"$

Apply L-hospital rule.

$\"\"$

Apply L-hospital rule.

$\"\"$

$\"\"$ .

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

$\"\"$

The series is divergent.