Raymond Smullyan was famous for his “knight and knave” logic problems (knights ALWAYS tell the truth; knaves ALWAYS lie). Here’s a simple one for young persons (or, anyone); not too hard, but challenging enough to give a sense of satisfaction when solved:
There are two people, A and B, each of whom is either a knight or a knave. “A” makes the following statement: ‘At least one of us is a knave.' What are ‘A’ and ‘B’?
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answer: A is a knight; B is a knave
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