In arithmetic sequence sum $\"\"$ .

Given first term is $\"\"$ .

Last term is $\"\"$ -------------->( 1 )

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

$\"\"$

Subtract 7 from each side. \ \

$\"\"$

Divide each side by 16.

$\"\"$

Substitute the values $\"\"$ , $\"\"$ , and $\"\"$ in formula.

Now sum of 17 term arithmetic sequence $\"\"$ .

$\"\"$

$\"\"$ .

The sum of a 17 term arithmetic sequence is $\"\"$ .