$\"\"$

\

The arithmetic series is $\"\"$ .

\

The first term is $\"\"$ .

\

The last term is $\"\"$ .

\

The common difference is $\"\"$ .

\

Find the number of terms in series.

\

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

\

Substitute $\"\"$ , $\"\"$ and $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

$\"\"$

\

Find the sum of the series.

\

Formula for sum of arithmetic series is $\"\"$ .

\

Substitute $\"\"$ , $\"\"$ and $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

The sum of series is $\"\"$ .

\

$\"\"$

\

The sum of series is $\"\"$ .