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Bank Robbery #2 - Logic Puzzles

After a local bank robbery, 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?

Ashley said:
   It wasn't Drew
   It wasn't Billie

Billie said:
   It wasn't Casey
   It was Drew

Casey said:
   It was Ashley
   It wasn't Drew

Drew said:
   It was Casey
   It wasn't Ashley

Puzzle Copyright © Kevin Stone

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Answer: Billie robbed the bank.

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

So according to Ashley, as one of the statements is false, it must have been either Drew or Billie.

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

Therefore it was Billie, which agrees with Casey and Drew's statements.

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