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수학동아 - 폴리매스
함께 풀고 싶은 문제
나도 수학쌤 문장제 문제를 변형해 문제를 내는 곳입니다.
17수락
2020.11.30 00:26
조회 351
http://www.polymath.co.kr/contents/view/23683 방 2 링크(방 2는 2020년 8월 3일날 작성했습니다)(무려 약 4달만에 돌아온 방 시리즈)
롱다리와 숏다리는 비상구 x번으로 나가 재벌 빅푸트의 집 털기에 성공했다
비록 미들다리를 잃었어도 그들은 사이코라서 기뻤다
다음 날 숏다리는 어떤 편지를 받고 기절했다
롱다리는 그 편지를 보려고 했지만 갑자기 앞이 어두워지며 숏다리의 비명소리가 들렸다
5시간 뒤 롱다리는 다시 앞이 보이기 시작했다
하지만 그곳에는 이런 편지가 있었다
나는 미들다리이다
너희는 나를 배신해서 나는 너희에게 복수를 하려고 한다
나는 현재 재벌 빅푸트와 동맹했을 확률이 45%이다
만약 동맹을 했으면 숏다리는 5번방에 있을 확률이 3번방에 있을 확률의 3배이다(5번방,3번방밖에 존재하지 않는다)
만약 동맹을 안했으면 숏다리는 무조건 5번방에 있다
너가 현재 있는 곳은 루퍼 마을일 확률이 65%이며 고스턴 마을일 확률이 35%이다
루퍼 마을에서 5번방으로 가면 5시간이 걸린다
3번방으로 가면 4시간 걸릴 확률이 2%, 8시간 걸릴 확률이 98%이다
고스턴 마을에선 어디를 가든 6시간이 걸릴 확률이 23%, 19시간이 걸릴 확률이 77%이다
하지만 너는 5시간 이상 움직이면 죽는다
그렇다면 너가 살으면서 숏다리를 구할 확률을 구하여라
그렇다면 숏다리를 풀어주지......
롱다리가 숏다리를 구할 확률을 구하세요
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