Case 355
The Stolen Prototype
A prototype vanished from a secured workroom.
Rule: exactly one suspect is guilty. The guilty suspect lies. Every innocent suspect tells the truth.
Cameron
“Either Taylor or Marley is guilty.”
Taylor
“Either Marley or Morgan is guilty.”
Marley
“Either Taylor or Dakota is guilty.”
Morgan
“Neither Marley nor Dakota is guilty.”
Dakota
“Marley and Morgan are both innocent.”
Who is guilty?
Solution: Taylor
If Taylor is guilty, Taylor's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.