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Function: _error_handler

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Function: model

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Function: get_footer

File: /volume1/web/PhpstormProjects/www_polymath_co_kr/index.php
Line: 315
Function: require_once

수학동아 - 폴리매스
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함께 풀고 싶은 문제
창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.
[창의 퍼즐] 자물쇠(재업)
초코파이(π) 2020.04.09 21:17 조회 773
문제 푼 사람 3명
공유하기
페이스북 트위터 카카오톡 카카오스토리 네이버블로그 네이버밴드

50개의 잠겨져 있는 자물쇠가 있다.

먼저 모든 자물쇠에 열쇠를 돌렸다.

그다음 2의 배수 번째인 모든 자물쇠에 열쇠를 돌리고

그렇게 3의 배수 번째인 자물쇠, 4의배수 번째인 자물쇠를 돌려

50의 배수 번째인 자물쇠까지 돌렸다.

몇번째 자물쇠들이 열려 있을까?

이 문제 어떠셨나요?

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