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수학동아 - 폴리매스
함께 풀고 싶은 문제
창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.
[창의 퍼즐] 일륜차 ( 센프란시스코 행 열차 여행기 1 )
노랑이
2021.05.30 20:49
조회 395
MR은 센프란시스코행 열차 대기소 앞에서 열차를 대기했다.
MR은 지금 MR이 있는 곳에서 정 반대편으로 가야하기 때문이다.
그래서 MR은 센프란시스코행 열차 대기소 안에 열차표 찍는 곳 으로 달려갔다.
그곳엔 하둡으로 열차표를 찍는 기계 21개가 있었다.
가로 31.24cm, 세로 54.19cm짜리인 이 기계는 5초마다 한번씩 표를 찍는다,
그러는 동시에 장거리 5m로 3.24mL의 소량의 잉크가 분사된다 ( 분사 폭 3m )
만약에 열차표 찍는 기계뒤에 3분마다 2명의 사람이 들어오고, 지금 9분 56초가 지났을때,
잉크의 맞는 사람의 수의 모든 경우의 수를 구할 때, 모든 경우의 수의 합을 구하시오,
-
노랑이
Lv.6
2021.05.30 20:50
단. 문. 같. 경, 문. 바. 니.
( 단순문제 같을 경우, 문의 바랍니다. )
지금 바로
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