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File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Cacher.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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Function: model

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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

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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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함께 풀고 싶은 문제
창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.
[창의 퍼즐] [확률]전염력
매스파이 2020.08.29 19:52 조회 450
문제 푼 사람 0명
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페이스북 트위터 카카오톡 카카오스토리 네이버블로그 네이버밴드

어느 인구가 100만명인 마을에 코로나 집단 감염이 일어나서 확진자가 200명 발생했다.확진자는 항상 하루에 2명을 만나며,면역이 있는 사람을 제외하고 모두 확진자와 만나면 코로나에 걸린다.면역이 있는 사람은 전체 인구의 25%이고,면역이 있는 사람은 확진자와 만나면 10%의 확률로 코로나에 걸린다.이 마을의 확진자가 1000명을 넘으려면 몇 일이 걸리는지 구하시오.

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