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Function: require_once
수학동아 - 폴리매스
함께 풀고 싶은 문제
창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.
17수락
2020.11.08 19:21
조회 344
수락은 연필 10개가 있다(단, 이 연필들은 육각연필이다)
그 10개 중 3개는 가짜일 확률이 20%다
만약 그 3개가 가짜가 아니라면 그 3개의 6개의 면에는 1,1,1,2,2,3 이 적혀있을 확률이 34%, 3,3,3,3,3,0 이 적혀있을 확률이 66%이다
나머지 7개 중 5개는 각 면에 모두 2가 적혀있을 확률이 33%, 모두 4가 적혀있을 확률이 34%, 모두 0이 적혀있을 확률이 33%이다
마지막으로 나머지 2개의 6개의 면에는 2,2,3,3,6,6 이 적혀있을 확률이 50%, 모두 1이 적혀있을 확률이 20%, 4,4,1,1,0,0 이 적혀있을 확률이 30%이다
그럼 수락이 연필 10개 중 7개를 뽑아 그것들을 굴렸을때 나온 수들의 합이 안 뽑은 3개의 연필의 모든 면의 합보다 크지 않을 확률은 얼마인가?
* 개념만 알면 풀 수 있는 문제에서 벗어나 엄청나게 꼬는 문제입니다
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17수락
Lv.9
2020.11.08 20:05
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