수학동아 - 폴리매스

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함께 풀고 싶은 문제

창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.

[창의 퍼즐] [대수/확률] 보도블록 공사

원파 2020.06.08 08:49 조회 596

문제 푼 사람 0명

페이스북 트위터 카카오톡 카카오스토리 네이버블로그 네이버밴드

어느 보도블록 공사를 하는 사람은 10% 확률로 하얀 벽돌을 깔고, 20% 확률로 검은 벽돌을 깔며, 20% 확률로 밝은 회색 벽돌을, 50% 확률로 어두운 회색 벽돌을 깐다. 그렇다면 이 사람이 n개의 벽돌을 깔았을 때 각 색의 벽돌은 몇 개가 될지 n에 관한 식으로 나타내어라. (벽돌을 0.5개 까는 경우 등은 무시한다.)

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