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Function: require_once
수학동아 - 폴리매스
함께 풀고 싶은 문제
창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.
K→C≡N
2020.03.28 02:48
조회 462
위 사진과 같이 방금 문제 수가 6886개였다. 화면을 거꾸로 설정하면 9889이다.
작성자는'11개만 더 쓰면 100n이네!'
라고 생각하고 11개를 더 썼다.
하지만 현실은 6897개로 100n이 되지 않는다.
거꾸로 써도 수가 된다는것만 알고 그 수가 어떤 수인지 모를 때,
최소 몇개의 문제를 내어야 100n이 포함되었음을 확신할수 있을까?(4자릿수이다)
지금 바로
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