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수학동아 - 폴리매스
함께 풀고 싶은 문제
창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.
sicma
2020.05.09 09:47
조회 627
cos가 sin의 집에 놀러가서 신기한 전화기를 발견했다. 이 전화기는 다음과 같은 패드로 이루어져 있다.
이 패드로 cos는 디음과 같은 게임을 만들어 냈다.
1. sin이 0의 위치에 손가락을 올린다.
2. sin이 눈을 감는다.
3. cos가 전화기의 패드를 돌린다.
4. sin이 원하는 때에 누른다.
이 시행을 11번 반복하면 xxx-xxxx-xxxx와 같이 만들어진다. 그리고 이 전화로 전화를 걸었을 때 없는 전화번호라면 sin이 이기고 있는 잔화 번호라면 cos가 이긴다.
(단, 없는 전화번호라도 0,1,2,3,4,5,6,7,8,9가 모두 들어가면 cos가 이긴다.)
<전화번호 규칙>
1.전화번호의 앞 세자리는 무조건 010이다.
2.나머지 8자리 중 앞자리에는 9가 무조건 들어가야 한다.
3.*과#이 들어가지 않는다.
cos가 이길 확률은 몇 퍼센트인가?
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sicma
Lv.11
2020.05.10 01:28
좋아요0
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아인수타인
Lv.12
2020.05.10 08:00
0%! sin이 반칙으로 cos이 돌리기 전에 0을 계속 눌러버린다!
(장난으로 쓰는 겁니다)
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sicma
Lv.11
2020.05.10 08:53
좋아요0
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