1에서
Warning: Undefined array key "n" in /users/2020/i2019041/public_html/2022/WebProg/ch08/exam08-05.php on line 16
까지 자연수의 합은
Warning: Undefined array key "n" in /users/2020/i2019041/public_html/2022/WebProg/ch08/exam08-05.php on line 17
0 입니다.