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Function: driver
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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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/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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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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Line: 315
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Line: 19
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.
관종이
2020.02.01 08:10
조회 584
관종이의 과학학원에서 20개의 자리가 있다.
여기에서 선생님의 시선에 들지 않고 매우 따듯한 자리가 3개가 있다.
그리고 선생님의 시선에 들고 매우 추운 자리가 10개가 있다.
전자를 1~3, 후자를 4~14라 하고, 나머지 보통 자리를 15~20이라 한다.
관종이네 반 친구들은 제비를 뽑아 자리를 정하려고 한다.
하지만 아이들을 매우 미워(?) 하는 선생님은
마음대로 제비 6개를 빼고 다시 안 좋은 자리로 다른 제비 6개를 다시 넣었다.
관종이가 제비를 뽑았을 때, 좋은 자리에 배정될 확률은?
-
문제에 오류가 있네요 추운자리가10 자리라고 하셨는데 4-14 자리면 11자리입니다
-
관종이
Lv.9
2020.02.02 01:03
죄송합니다.
4번에서 13번으로 풀어 주세요!
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