| [ QuizWit ] in KIDS 글 쓴 이(By): guest (sol) <jupiter.kaist.ac> 날 짜 (Date): 2001년 12월 18일 화요일 오후 11시 29분 16초 제 목(Title): can of balls You have a can with four balls of different colours. Randomly you draw two at a time, then paint the first ball to match the second. What is the expected number of drawings before all balls are the same colour? from David Nygaard. |