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抜き打ちテストのパラドックス
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1. Unexpected hanging paradox​The unexpected hanging paradox, hangman paradox, unexpected exam paradox, surprise test paradox or prediction paradox is a paradox about a person's expectations about the timing of a future event (e.g. a prisoner's hanging, or a school test) which he is told will occur at an unexpected time. Despite significant academic interest, there is no consensus on its precise nature and consequently a final 'correct' resolution has not yet been established.
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