$\"\"$

The series is $\"\"$ .

$\"\"$

The series is in the form of geometric series.

The general form of geometric series is $\"\"$ .

Compare the series with general form.

Here $\"\"$ .

The series is diverges since the value of $\"\"$ .

Therefore, the series $\"\"$ is diverges by using geometric series test. $\"\"$

The series $\"\"$ is diverges by using geometric series test.