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Function: require_once
수학동아 - 폴리매스
함께 풀고 싶은 문제
창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.
원파
2021.01.23 09:26
조회 467
호그와트 3학년생 원파는 어둠의 마법 방어술 시험을 봅니다.
3학년이지만 굉장히 '마법 선행'을 한 원파는 패트로누스를 만들어내는 것을 보이기로 했습니다.
패트로누스는 흰토끼, 학, 염소, 말, 닭, 유니콘 이 될 수 있습니다.
이는 마법사가 처음 패트로누스를 불러낼 때 정해지고, 영영 바뀌지 않습니다.
원파는 패트로누스를 만드는 것을 딱 2번 시도합니다.
한 번 실패할 확률은 75%이고, 적어도 둘 중 한 번은 성공합니다.
이때, 각 동물마다 패트로누스로 1번 혹은 2번 볼 확률을 구하세요.
또한, 패트로누스를 만들때는 기쁜 생각을 가득 해야 패트로누스가 오래 지속된다고 합니다.
원파의 머릿속에는 생각을 담을 수 있는 저장소가 10군데 있습니다.
각각 저장소1, 2, ..., 저장소10이라고 합시다.
저장소i에는 X[i]개의 기쁜생각, Y[i]개의 나쁜생각이 존재합니다.
저장소 하나에는 생각 하나만 선택됩니다.
이때 저장소 중 기쁜생각이 선택된 저장소가 50% 초과여야 패트로누스가 불러내진다면,
패트로누스가 불러내질 확률을 구하세요.
-
괴물
Lv.3
2021.01.24 03:18
해덕으로서 말씀드리면 패트로누스는 바뀔 수 있습니다
예로 님파도라 통스의 패트로누스
그리고 호그와트 어마방 시험은 정해진 걸 해야 하므로
패트로누스는 o.w.l이나 n.e.w.t때 보여주는 걸 추천합니다
-
원파
Lv.9
2021.01.24 05:07
매번 바뀌면 문제로써 출제하기 어려워 일부는 사실과 다르게 출제했습니다!
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