$\"\"$

\

The sequence is $\"\"$ .

\

Find $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

$\"\"$ .

\

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

\

$\"\"$

\

Find $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

Hence, the series $\"\"$ is converges to $\"\"$

\

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

\

$\"\"$

\

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