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Who is the murderer ?

  • A.A
  • B.B
  • C.C
  • D.D

Answer: D

The murderer is D.

B cannot be the murderer: if he were, D's statement 'B is the murderer' would be true, so D's other statement, 'C is innocent', would be false, making C guilty too, but there is only one murderer. C is innocent, because D's true statement is now 'C is innocent'.

A cannot be the murderer either: the murder was done with a knife at the victim's home in town, so if A were the murderer both 'I have never touched a knife' and 'I was not in town' would be false, but each suspect has one true statement. With A, B and C cleared, D is the murderer, which also makes B's statement 'A is the murderer' false and his card game with C true, as required.

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