수학동아 - 폴리매스

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함께 풀고 싶은 문제

창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.

[창의 퍼즐] 재연재 (4개월 지남) 샷건[대수]

우럭 2020.10.31 20:16 조회 414

문제 푼 사람 0명

페이스북 트위터 카카오톡 카카오스토리 네이버블로그 네이버밴드

연우는 지하실에서 하나의 산탄총을 발견했다.

이 산탄총은 n번 산탄됬을 때의 나온 총알 크기의 식이

1/{(2n)²-1}일 때,

n번째 까지 나온 모든 산탄총의 총알 크기 합이 1.48보다 커지는 최소의 n은?

(단, 총알의 처음 크기는 1이고, 1번 산탄되면 총알 크기가 1/2²-1인것이다.)

이전글 (탐정 건)(방정식) 암호!

다음글 뒤집기[퍼즐]

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