Case 271
The Cut Cable
A network cable was cut in a restricted room.
Rule: exactly one suspect is guilty. The guilty suspect lies. Every innocent suspect tells the truth.
Sam
“Casey is innocent.”
Jules
“Sam is guilty.”
Morgan
“Either Jules or Rowan is guilty.”
Rowan
“Either Sam or Jules is guilty.”
Casey
“Neither Sam nor Rowan is guilty.”
Who is guilty?
Solution: Jules
If Jules is guilty, Jules's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.