Numbers in mind puzzle

John has one of the numbers 1, 2, or 3 in mind. Jacob is allowed to ask one question to John to find out which of these three numbers he has in mind. John will answer this question only with the answers “yes”, “no”, or “I don’t know”.

Which question should Jacob ask John to find out in one time which number he has in mind?

SherlockHolmes Expert Asked on 25th January 2018 in Logic Puzzles.
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  • 1 Answer(s)

    Jacob will ask “Is the number in your mind greater than 2″?
    If John says”Yes”, then it is obviously 3.
    If he says”No”, then it is obviously 1.
    If he says”I don’t know”, then it is 2 because, 2 is not greater than 2.
    Similarly the question can be asked as ” Is the number in your mind less than 2″? and the same strategy be applied.

    Rahim Starter Answered on 10th March 2018.

    Answer for question “Is the number in your mind greater than 2″  NO means it can be 1 or 2 any of the number.

    on 2nd August 2018.
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