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Function: _error_handler

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Function: model

File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Common.php
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Function: getFloatingMyInfo

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Line: 559
Function: get_footer

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

수학동아 - 폴리매스
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[창의 퍼즐] 동아리를 만들었더니
전자기역학 2020.04.05 22:49 조회 506
문제 푼 사람 0명
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페이스북 트위터 카카오톡 카카오스토리 네이버블로그 네이버밴드

역학중학교 2학년 몇 명이서 동아리를 만들었다. 역학중학교 학생 수는 100명이고, 모든 학생이 하나 이상의 동아리에 가입했다. 임의의 동아리에 대해 그 동아리에 포함된 학생 수는 9명이다. 또한, 임의의 두 학생에 대해 두 학생이 동시에 가입한 동아리는 딱 한 개라고 할 때, 물음에 답하여라.

(1) 동아리 수는 얼마인가?

(2) 한 학생의 가입한 동아리 수는 최대 몇 개인가?

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