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Function: require_once
수학동아 - 폴리매스
함께 풀고 싶은 문제
창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.
[창의 퍼즐] [확률]대모험 IV : 산소 호흡기
space
2020.09.18 20:40
조회 565
먼저 도착한 친구에게 물어보니 '속았지'라는 쪽지 밖에 없었다
알고보니 저번 편지에 숨은 글씨가 있었다
그래서 우리는 세레스 왜소 행성으로 가야한다
더 필요한 건 산소 호흡기랑 우주복, 로켓이다
그런데 옆 나라에서 뽑기를 하여 3등을 하면 산소통을 준다고 한다(30000톤!)
총 542명이 참가 했고 3등은 5명이다
그래서 번호를 뽑고나서 1,2,3등 번호를 말하려는데 내 옆 번호 사람이 갑자기 화장실에 간다고 해서 그 번호가 나오면 다시 뽑는다
난 328번, 친구는 329번이다
그럼 1등은 1명, 2등은 2명이라 했을 때 산소통을 받을 확률은 얼마인가?
지금 바로
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