$\"\"$

The arithematic series is $\"\"$ .

$\"\"$

The first term of this series is $\"\"$ .

The last term of this series is $\"\"$ .

The number of terms is equal to the upper bound minus the lower bound plus one.

Here number of terms are $\"\"$ .

Sum of the series : $\"\"$ .

Substitute corresponding values.

$\"\"$

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

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