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?
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.
Your Answer
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