Paranormal activity investigation puzzle

You are an expert on paranormal activity and have been hired to locate a spirit haunting an old resort hotel. Strong signs indicate that the spirit lies behind one of four doors. The inscriptions on each door read as follows:

Door A: It’s behind B or C
Door B: It’s behind A or D
Door C: It’s in here
Door D: It’s not in here

Your psychic powers have told you three of the inscriptions are false, and one is true. Behind which door will you find the spirit?Paranormal activity investigation puzzle

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SherlockHolmes Expert Asked on 6th November 2016 in Brain Teaser.
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  • 1 Answer(s)

    Answer: Door D

    Deduction:

    The inscriptions:

    Door A: It’s behind B or C
    Door B: It’s behind A or D
    Door C: It’s in here
    Door D: It’s not in here

    The premise: Only one of these statements is true.

    Assume that the spirit is behind:

    Door A: Then, inscriptions on B and D becomes true. (B says ‘behind A or D’, and D says it’s not there.) This can’t be the case because only one statement is true.
    Door B: Similar to the above, it means statements of A and D are true, which is contrary to the premise.
    Door C: Both the statements on A and C itself are true – A says ‘behind B or C’, and C says it’s there itself.

    This leaves the only possible option as Door D.

    If the spirit is behind door D, the statement on door B becomes true and all other statements, false.

    Hence the result.

    Viji_Pinarayi Expert Answered on 6th November 2016.
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