Case 226
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.
Finley
“Noah and Parker are both innocent.”
Noah
“Either Kendall or Lane is guilty.”
Kendall
“Finley and Parker are both innocent.”
Lane
“Finley is guilty.”
Parker
“Finley and Kendall are both innocent.”
Who is guilty?
Solution: Lane
If Lane is guilty, Lane's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.