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Function: require_once

수학동아 - 폴리매스
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[문장제 문제&개념응용] 질투심 많은 부부 앉히기
Plum 2021.02.17 07:45 조회 444
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페이스북 트위터 카카오톡 카카오스토리 네이버블로그 네이버밴드

5쌍의 부부가 원형으로 배열된 10개의 의자에 앉을려고 한다. 그러나 이들 10명은 모두 질투심이 많아서,  남자는 자신의 부인 옆에는 자신을 제외한 남자는 앉을 수 없고, 여자는 자신의 남편 옆에는 자신을 제외한 여자는 앉을 수 없다. 이러한 조건을 만족하도록 10명이 앉을 수 있는 방법의 수를 k라 할 때, k÷120의 값은? (단, 회전해서 같은 것은 서로 다른것으로 보자)

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