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Function: driver
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/controllers/ver3/Contents.php
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Function: driver
File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Cacher.php
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Function: initiateCache
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/libraries/Common.php
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File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/controllers/ver3/Contents.php
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Line: 799
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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/controllers/ver3/Contents.php
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File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Common.php
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Function: _error_handler
File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Common.php
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Function: model
File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Common.php
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Function: getFloatingMyInfo
File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/controllers/ver3/Contents.php
Line: 559
Function: get_footer
File: /volume1/web/PhpstormProjects/www_polymath_co_kr/index.php
Line: 315
Function: require_once
수학동아 - 폴리매스
함께 풀고 싶은 문제
창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.
우럭
2020.12.26 08:38
조회 341
여러분도 크리스마스 트리에 있는 전등,
한번쯤 봤을 것이다. 반짝이는 것이 참 아름다운데,
가끔 보면 규칙이 존재하기도 한다.
현재 내가 가지고 있는 전등은 총 72개의 LED로 이루어져 있으며,
나올 수 있는 색깔은 빨/흰/노/초 4색이 존재한다. 규칙은 색마다 다르며,
빨간색은 2n번째 불들에 100% 확률로 등장한다.
흰색은 3n번째 불에 무조건 들어오고, 추가로 4n의 불에 50% 확률로 등장한다.
노란색은 5n번째 불들에 50%확률, 6n번째 불들에 25%확률로 등장하며,
초록색은 7n번째 블록들에 대해 70%확률, 7이상의 소수의 배수 번째
블록들에 대해서는 50%의 확률로 등장한다.
서열은 빨 < 흰 < 노 < 초로, 서열이 높을수록 다른 전등의 색을 덮을 수 있다.
이때, 빨간색과 초록색 전등의 색 분포가 45%를 넘어갈 확률은?
지금 바로
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