1에서
Warning: Undefined array key "n" in /users/2020/i2019056/public_html/2022/WebProg/ch08/exam08-07.php on line 19
까지 자연수의 합은
Warning: Undefined array key "n" in /users/2020/i2019056/public_html/2022/WebProg/ch08/exam08-07.php on line 20
입니다.