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Function: require_once

수학동아 - 폴리매스
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[창의 퍼즐] 매우 똑똑한 두 아이
math zone 2020.11.03 23:04 조회 351
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페이스북 트위터 카카오톡 카카오스토리 네이버블로그 네이버밴드

매우 똑똑한 두 아이 J와 M이 각각 자연수를 하나씩 택하고 B에게 알려주었다. B는 두수의 합을 한 카드에, 두 수의 곱을 다른 카드에 쓴 후, 한 장은 숨기고 다른 한장만 J와 M에게 보여주었다. J가 그 수(2002였다)를 본 후 M이 선택한 수가 얼마인지 모르겠다고 했다. 그걸 듣고, M도 J가 택한 수가 얼마인지 모르겠다고 말했다. M이 택한 수는 얼마인가?

 

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