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Three cups problem : ウィキペディア英語版 | Three cups problem
The three cups problem is a mathematical puzzle that, in its most common form, cannot be solved. In the beginning position of the problem, one cup is upside-down and the other two are right-side up. The objective is to turn all cups right-side up in no more than six moves. You must turn over exactly two cups at each move. ==Solvable version==
The solvable (but trivial) version of this puzzle begins with one cup right-side up and two cups upside-down. To solve the puzzle in a single move, you need only turn up the two cups that are upside down — after which all three cups are facing up.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Three cups problem」の詳細全文を読む
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