Case 197
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.
Kendall
“Peyton and Avery are both innocent.”
Peyton
“Avery is innocent.”
Elliot
“Kendall and Peyton are both innocent.”
Drew
“Either Peyton or Elliot is guilty.”
Avery
“Neither Kendall nor Elliot is guilty.”
Who is guilty?
Solution: Drew
If Drew is guilty, Drew's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.