In a village of truth-tellers (who always tell the truth) and liars (who always lie), you meet two inhabitants, Pip and Pop. Pip says, 'At least one of us is a liar.' What are Pip and Pop?
Pip is a truth-teller and Pop is a liar
If Pip were a liar, his statement 'At least one of us is a liar' would be false, which means neither is a liar (both are truth-tellers)—a contradiction. Therefore, Pip must be a truth-teller. Since his statement is true, at least one is a liar, making Pop the liar.
About this riddle
Logic riddles give you a few facts and ask what must be true. List what you know, cross out what cannot be, and see what is left.
Difficulty: Medium. More like this: Logic riddles with answers or try Einstein's Logic Grid for a different kind of puzzle.
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