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File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Cacher.php
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File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Cacher.php
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File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Common.php
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File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/models/ver3/Contents_model.php
File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Common.php
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File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/controllers/ver3/Contents.php
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File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/models/ver3/Article_model.php
File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Common.php
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File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/controllers/ver3/Contents.php
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File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/models/ver3/Article_model.php
File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Common.php
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File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/controllers/ver3/Contents.php
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수학동아 - 폴리매스
함께 풀고 싶은 문제
창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.
아인수타인 2020.06.21 08:21
조회 713
페루마가 평소에 자주 이용하는 역은 6호선 화랑대역이다. 그런데 어찌된 일인지는 모르겠지만 오늘은 화랑대역 다음 역인 봉화산역에서 지하철을 탔다. 6호선 종점은 봉화산역이 아니라 다음 역인 신내역이지만, 3분의 2 가량의 열차들은 봉화산역에서 종착하고 봉화산역에서 출발한다. 페루마가 오늘 탄 열차는 봉화산역에서 출발하는 열차였다. 따라서, 열차를 탈 때 사람이 단 한 명도 없다. 그런데 최근에는 코로나 19 사태 때문에 열차 이용객이 많이 줄었다. 페루마가 보기에 봉화산역에서 탑승하는 승객은 정확히 9명뿐이었다. 6호선 열차는 총 8개의 객차가 있다. 각 칸에 누가 타는지는 신경 쓰지 않고, 단지 몇 번 칸에 몇 명이 타는지만 신경 쓰자. 예를 들어, 제일 앞 칸에 페루마, 파스탈, 고우스가 탔으면, 맨 앞 칸에 누가 탔는지는 모르겠지만 3명이 타고 있다고 보는 것이다(더 쉽게 말하면, 사람은 전부 쌍둥이라서 구분되지 않는다). 그러면 이 때, 봉화산역에서 사람들이 승차하는 방법은 몇 가지인가?
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