$\"\"$

The arithmetic series is $\"\"$ .

$\"\"$

The first term of the series is $\"\"$ and the last term is $\"\"$ .

Therefore, $\"\"$ , $\"\"$ and $\"\"$ .

The number of terms is equal to the upper bound minus the lower bound plus one, which is $\"\"$

or $\"\"$ .

Find the sum of the series.

The sum of the arithmetic series can be calculated by using the formula $\"\"$ .

$\"\"$

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