Step 1: \ \

\

The formula for $\"\"$ term is $\"\"$ .

\

where $\"\"$ is first term and $\"\"$ is common difference.

\

$\"\"$ term is $\"\"$ .

\

$\"\"$ ---------> equation (1).

\

$\"\"$ term is $\"\"$ .

\

$\"\"$ -------> equation (2).

\

Step 2: \ \

\

Find $\"\"$ , $\"\"$ values by solving above two equations.

\

Subtract the equation (1) from (2).

\

$\"\"$

\

$\"\"$

\

Substitute $\"\"$ in equation (1).

\

$\"\"$

\

$\"\"$ .

\

Step 3: \ \

\

The recursive formula is $\"\"$ .

\

$\"\"$ .

\

Substitute $\"\"$ and $\"\"$ in $\"\"$ .

\

$\"\"$

\

$\"\"$ .

\

Solution: \ \

\

The first term is $\"\"$ .

\

The common difference is $\"\"$ .

\

Recursive formula is $\"\"$ .

\

The $\"\"$ term is $\"\"$ .