$\"\"$

The series is $\"\"$ .

Consider $\"\"$ .

Hence $\"\"$ .

Substitute the corresponding values in $\"\"$ .

$\"\"$

If the value of $\"\"$ then $\"\"$ .

$\"\"$

The series is converges if and only if the value $\"\"$ .

$\"\"$ .

Therefore, the series is converges in the interval $\"\"$ .

$\"\"$

The series is converges in the interval $\"\"$ .