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창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.
[창의 퍼즐] [조합] 지루한 수
Byzantium 2020.07.09 20:56 조회 550
문제 푼 사람 0명
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페이스북 트위터 카카오톡 카카오스토리 네이버블로그 네이버밴드

여섯 자리 자연수들 중, 각 수에 쓰인 모든 숫자를 적어도 두 번 이상 포함하는 수들은 '지루한 수'라고 부르자.

 

예를 들어 767756은 지루한 수가 아니고, 466646은 지루한 수이다.

 

지루한 수의 개수를 구하여라.

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  •  
    Mata Lv.6 2020.07.09 22:47 비밀댓글
    확인요청중

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    •  
      Byzantium Lv.6 2020.07.09 22:59 비밀댓글
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