| [ QuizWit ] in KIDS 글 쓴 이(By): iLUSiON (띠띠빤쮸) 날 짜 (Date): 2005년 12월 17일 토요일 오후 11시 00분 09초 제 목(Title): Re: [Q] 1에서 n까지 자연수의 역수의합... looking at his solution, i think i now remember i have seen this trick somwhere when i was a math student in UBC.... sometime in 1991. probably one of those mathematical monthly or putnam competition problem. i am getting old ^^ iLUSiON - le plus grand de tous http://cyworld.nate.com/ilusion |