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수학동아 - 폴리매스
본문바로가기
함께 풀고 싶은 문제
창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.
[창의 퍼즐] 두더지 잡기
K→C≡N 2019.10.13 00:08 조회 945

두더지를 잡으려 한다. 두더지10마리는 모두 땅 밑에 있고, 20개의 땅굴 중에서 무작위로 나타난다.

이 20개의 땅굴 중

A방의 땅굴 5개는 두더지가 나타날 확률이 120%이고, 

B방의 나머지 15개는 각각 나타날 확률이 26.666666666%이다.

두 방 중 어느 방에서 기다리겠는가?

이 문제 어떠셨나요?

글쎄요

0

어려워요

0

  •  
    해결
    21세기오일러 Lv.11 2019.10.13 00:19 비밀댓글
    비밀 댓글이 등록 되었습니다.
    댓글 작성하기 댓글수1
    •  
      K→C≡N Lv.11 2019.10.14 07:23

      제 다른 문제인 馬,식물이 자라며 도 풀어주세요!

      좋아요0
  •  
    디듀우 Lv.7 2019.10.13 02:35

    확률이 120%면 1을 넘는 건데 그건 불가능합니다. 1번 시행했는데 1번 넘게 사건이 일어난다는 게 됩니다. 21세기오일러님은 대체 어떻게 맞추신 거죠?

    댓글 작성하기 좋아요0 댓글수6
    •  
      21세기오일러 Lv.11 2019.10.13 03:01

      100%라 하고 풀었습니다.

      좋아요0
    •  
      디듀우 Lv.7 2019.10.13 03:38

      12%였는데 오타 나신 건가요?

      좋아요0
    •  
      K→C≡N Lv.11 2019.10.13 07:15 비밀댓글
      비밀 댓글이 등록 되었습니다!
    •  
      디듀우 Lv.7 2019.10.13 18:39

      그렇다면 확률이 아니라 나오는 두더지 수의 기댓값이 되야 하지 않나요?

      좋아요0
    •  
      K→C≡N Lv.11 2019.10.14 07:23

      그렇네요

      좋아요0
    •  
      디듀우 Lv.7 2019.10.14 22:03

      괜찮아요. 헷갈리실 수도 있죠.

      좋아요0
  •  
    해결
    Horizontal Lv.5 2019.10.13 06:28 비밀댓글
    비밀 댓글이 등록 되었습니다.
    댓글 작성하기 댓글수2
    •  
      K→C≡N Lv.11 2019.10.13 07:17 비밀댓글
      비밀 댓글이 등록 되었습니다!
    •  
      Horizontal Lv.5 2019.10.13 08:22 비밀댓글
      비밀 댓글이 등록 되었습니다!
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