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Function: driver

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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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Function: get_footer

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

수학동아 - 폴리매스
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[창의 퍼즐] 병속에 병균
로보카폴리 2020.03.05 20:16 조회 484
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페이스북 트위터 카카오톡 카카오스토리 네이버블로그 네이버밴드

처음에 병속에 병균 1개가 있었다. 이 병균은 1분 마다 10배로 번식한다. 그렇게해 그 병균이 30분동안 번식이 되고 있었는데, 갑자가 병이 열려 버려서 30초마다 그 병균들의 정확히 2/5가 병에서 빠져나간다(병을 연지 30초 뒤에 2/5이 빠져 나가고 1분 뒤에 또 남은 것중 2/5이 빠져 나가고 나머지 병균들은 두배가 된다.) 이과정을 반복했을때 몇초 후에 병균이 5마리 이하가 되는가?

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