Case 307
Who is guilty?
Exactly one suspect is guilty. The guilty suspect lies. Every innocent suspect tells the truth.
Ruby: “The guilty person is one of Ruby, Finn or Jade.”
Theo: “Mila is innocent.”
Mila: “The guilty person is one of Ruby, Mila or Jade.”
Finn: “Finn is innocent.”
Jade: “The guilty person is one of Ruby, Theo or Mila.”
Random case Solution: Jade is guilty. Testing each possible culprit leaves this as the only assignment where the culprit's statement is false and all four innocent statements are true.