| [ QuizWit ] in KIDS 글 쓴 이(By): iLUSiON (화려한집념) 날 짜 (Date): 2003년 1월 30일 목요일 오전 06시 08분 05초 제 목(Title): Re: 확률이 1/e 인 게임은? there is. i saw one in combinatorics book long time ago. proably about 10 years ago. let me reconstuct it from lost memory. hehe... 1/e = 1 - 1/2! + 1/3! - 1/4! + .... then what.... hmmm..... finite term would be 1 - 1/2! + 1/3! ...... (-1)^{n-1}1/n! i think in combinatorics, there is a theorem called inclusion and exclusion principle which counts the number of set elements union or intersection whatever. basically you expand teh probability P(A_1 \cap ....\cap A_n) = 1 - P(....) + P(....) -.... just construct events A_i that corresponds to 1/x! am i geneus or what ? hehehe... hmmm how do i spell genius? geneous? i think ge something is correct. kiki.... iLUSiON whitepolarcow@hotmail.com |