$\"\"$

The sequence is $\"\"$ .

A sequence $\"\"$ is convergent, then there exist $\"\"$ , where $\"\"$ is a constant.

$\"\"$

Consider $\"\"$ .

$\"\"$ .

Consider $\"\"$ .

$\"\"$ .

Therefore, the limit $\"\"$ is divergent at $\"\"$ .

$\"\"$

The limit $\"\"$ is divergent at $\"\"$ .