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수학동아 - 폴리매스
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함께 풀고 싶은 문제
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[창의 퍼즐] 비밀번호 정하기
디듀우 2019.11.15 06:42 조회 635
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페이스북 트위터 카카오톡 카카오스토리 네이버블로그 네이버밴드

동수의 노트북 비밀번호는 a~z까지의 알파벳 26개를 배열한 것이다. 동수는 비밀번호를 새로 바꾸는데, 이전과 같은 자리에 있는 알파벳이 없고 각 알파벳의 바로 다음 알파벳이 이전과 같지 않게 하려고 한다. 단, 맨 뒤 알파벳 다음 알파벳은 첫 알파벳이다. 동수가 만들 수 있는 비밀번호는 몇 가지인가?

예시)

예전 비밀번호-abcd

새 비밀번호- bcad (x) d또 4번째 자리

                 dcab (x) a뒤에 또 b옴

                 dbca (o)

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  •  
    신지운 Lv.1 2019.11.16 02:02 비밀댓글
    확인요청중
    비밀 댓글이 등록 되었습니다.
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    •  
      디듀우 Lv.7 2019.11.16 02:03

      풀이와 함께 다시 달아주세요!

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