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Function: driver

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Function: _error_handler

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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
Line: 392
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] [확률] 길 외우기
infinitepi 2020.07.22 05:34 조회 553
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페이스북 트위터 카카오톡 카카오스토리 네이버블로그 네이버밴드

나는 길을 외운다.

그런데 첫번째 간 길은 못 외울 확률이 30%고,

첫번째 갔을 때 못 외운 길은 두 번째 갈 때 또 못 외울 확률이 25%이다.

이렇게 옷 외울 확률이 5%씩 낮아진다.

이때, 6번쨰까지 못 외우고 7번쨰야 외울 확률을 구하여라.

이 문제 어떠셨나요?

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