$\"\"$

\

The sequence is $\"\"$ .

\

Find $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

If $\"\"$ then $\"\"$ .

\

$\"\"$

\

$\"\"$ .

\

$\"\"$ .

\

Therefore, the series is converges to $\"\"$ .

\

$\"\"$

\

Find $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

Hence, the series is diverges.

\

Therefore, the series $\"\"$ is converges and $\"\"$ is diverges.

\

$\"\"$

\

The series $\"\"$ is converges and $\"\"$ is diverges.