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Puzzle - Answer

BurglarAfter a local Post Office burglary, five 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?

Brian said:
   It wasn't Charles
   It was Alan

Derek said:
   It was Charles
   It wasn't Alan

Charles said:
   It was Brian
   It wasn't Eric

Alan said:
   It was Eric
   It wasn't Brian

Eric said:
   It was Derek
   It was Alan

 [Ref: ZQRF] © Kevin Stone

Answer: Derek.

Since each suspect told the truth just once, Eric's statements mean that it was either Derek or Alan.

If it was Alan, then both of Brian's statements would be true, which isn't allowed (and similarly both of Derek's would be false).

Therefore it was Derek. This can be double checked with all of the other statements. QED.

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