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Function: model

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Function: get_footer

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Function: require_once

수학동아 - 폴리매스
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함께 풀고 싶은 문제
창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.
[창의 퍼즐] 원파는 하양색이 싫어!
원파 2021.02.27 09:37 조회 639
문제 푼 사람 7명
공유하기
페이스북 트위터 카카오톡 카카오스토리 네이버블로그 네이버밴드

원파는 하양색이 싫어!

원파는 하양색이 싫은데 원파한테 하얀 구슬만 10개가 있어.

그래서 원파는 다 검은색으로 바꿔버리고 싶어.

구슬 10개 중에 무작위로 5개를 뽑은 다음에, 그 5개를 검게 칠할 수 있어.

그럼, 최소는 2번 뽑으면 되겠지? 최대는 무한대일거고.

결론적으로, 다 검은색이 되려면 평균적으로 몇 번 뽑아야 돼?

원파가 계산하면 안되냐고? 싫어. 난 귀찮거든 ㅎ

이 문제 어떠셨나요?

글쎄요

5

어려워요

2

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