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Difficulty: MediumPuzzle Details

Puzzle IconAfter a local Post Office burglary, four suspects were being interviewed. Below is a summary of their statements.

Police know that each of them told the truth in one of the statements and lied in the other.

From this information can you tell who committed the crime?

Alan said:
   It wasn't Derek
   It wasn't Brian

Brian said:
   It wasn't Charles
   It was Derek

Charles said:
   It was Alan
   It wasn't Derek

Derek said:
   It was Charles
   It wasn't Alan

Show Hint Show Answer Print Puzzle
[Ref: ZEFV] © Kevin Stone 

Answer: Brian robbed the Post Office.

We know that each of them told the truth in one of the statements and lied in the other.

So according to Alan, as one of his statements is false, it must have been either Derek or Brian.

If it was Derek then Brian's statements would both be true, which isn't allowed.

Therefore it was Brian, which agrees with Charles and Derek's statements.


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[Added September 1997]

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