$\"\"$

The arithmetic sequence is $\"\"$ .

Find the common difference.

$\"\"$

The common difference is $\"\"$ .

Find the explicit formula for $\"\"$ term.

Formula for $\"\"$ term of arithmetic sequence is $\"\"$ .

Substitute $\"\"$ and $\"\"$ in $\"\"$ term of arithmetic sequence.

$\"\"$

$\"\"$ .

$\"\"$

Find recursive formula for $\"\"$ term.

First term is $\"\"$ .

In arithmetic sequence, next term is sum of common difference and previous term.

$\"\"$ .

Here $\"\"$ , $\"\"$ .

$\"\"$

Explicit formula: $\"\"$ .

Recursive formula: $\"\"$ , $\"\"$ .