MINI ALIBImedium
Uncle Logic’s last cookie has disappeared.
Exactly ONE suspect is lying.
WHO TOOK THE COOKIE?
Clues
- Ella“Theo is lying.”
- Emmett“Felix took it.”
- Felix“Emmett is telling the truth.”
- Theo“Emmett took it.”
Answer
Felix
Why it works
Emmett and Felix must both be truthful, which identifies Felix and leaves Theo as the single liar.
- Emmett says Felix took the cookie. Felix says Emmett is telling the truth, so Emmett’s and Felix’s statements must have the same truth value.
- They cannot both be lying, because the rule allows exactly one liar. Therefore both statements are true.
- Emmett’s true statement means Felix took the cookie.
- Theo’s claim that Emmett took it is false, making Theo the one liar. Ella’s statement that Theo is lying is therefore true.