On Logic Island, every inhabitant either always tells the truth or always lies. You meet Ava and Liam. Ava says, 'At least one of us is a liar.' What are Ava and Liam?
Ava is a truth-teller and Liam is a liar.
If Ava were a liar, her statement would be true, which is a contradiction. Thus, Ava must be a truth-teller. Because her statement is true, at least one of them must be a liar, which means Liam is 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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