$\"\"$

\

The arithmetic series $\"\"$ and $\"\"$ .

\

Find the common difference $\"\"$ .

\

$\"\"$ .

\

Here $\"\"$ , $\"\"$ and $\"\"$

\

The general form of $\"\"$ -terms of arithmetic series $\"\"$

\

$\"\"$

\

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

\

$\"\"$

\

$\"\"$

\

Find the $\"\"$ term.

\

$\"\"$

\

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

\

$\"\"$

\

$\"\"$ .

\

The arithmetic equation is $\"\"$ . $\"\"$

\

The arithmetic equation is $\"\"$ .