수학동아 - 폴리매스

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함께 풀고 싶은 문제

창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.

[창의 퍼즐] 동그라미 박사

GUN.007 2019.12.28 00:54 조회 682

문제 푼 사람 0명

페이스북 트위터 카카오톡 카카오스토리 네이버블로그 네이버밴드

동그라미 박사가 은행 카드를 위한 제 자릿수 핀을 잊어버렸다. 각 자릿수는 0, 1, ....., 9 중 하나일 수 잇다. 그가 이럭할 수 있는 것은 핀에 0이 적어도 하나는 있었다는 것뿐이다. 그가 시도해야 하는 핀 수의 최댓값은 얼마인가?

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