Case 240
The Disabled Camera
A security camera was deliberately switched off.
Rule: exactly one suspect is guilty. The guilty suspect lies. Every innocent suspect tells the truth.
Parker
“Either Blake or Taylor is guilty.”
Blake
“Frankie is innocent.”
Frankie
“Taylor is innocent.”
Avery
“Frankie and Taylor are both innocent.”
Taylor
“Parker is guilty.”
Who is guilty?
Solution: Parker
If Parker is guilty, Parker's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.