| [ QuizWit ] in KIDS 글 쓴 이(By): guest (sol___) <schroeder.kaist.> 날 짜 (Date): 2001년 10월 18일 목요일 오후 10시 17분 04초 제 목(Title): urn puzzle An urn contains n balls of different colors. Randomly select a pair, repaint the first to match the second, and replace the pair in the urn. What is the expected time until the balls are all the same color? |