$\"\"$

The sequence is $\"\"$ .

Find the common difference $\"\"$ .

$\"\"$

Here $\"\"$ and $\"\"$ .

The general form of $\"\"$ -terms of arithmetic sequence $\"\"$ .

Substitute $\"\"$ and $\"\"$ in the general form.

$\"\"$

$\"\"$ .

The $\"\"$ -terms of arthmetic sequence is $\"\"$ .

$\"\"$

The $\"\"$ -terms of arthmetic sequence is $\"\"$ .