Case 332
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.
Rowan
“Morgan and Kendall are both innocent.”
Morgan
“Drew is innocent.”
Kendall
“Morgan and Drew are both innocent.”
Drew
“Rowan and Kendall are both innocent.”
Alex
“Either Rowan or Drew is guilty.”
Who is guilty?
Solution: Alex
If Alex is guilty, Alex's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.