$\"\"$

The corner section of football stadium has $\"\"$ seats in the first row, hence $\"\"$ .

There are $\"\"$ row in all, hence $\"\"$ .

Each successive row contains two additional seat, hence $\"\"$ .

Hence the sequence is $\"\"$ .

The sum of the first $\"\"$ terms of an arithmetic sequence $\"\"$ .

The formula for $\"\"$ term: $\"\"$ .

$\"\"$

$\"\"$ .

Therefore, there are $\"\"$ seats in corner section of football stadium.

$\"\"$

Therefore, there are $\"\"$ seats in corner section of football stadium.