Three Guards

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Three guards stand at a gate. Guard 1: 'Guard 2 is a knight.' Guard 2: 'Guard 1 is a knave.' Guard 3: 'Guard 2 is a knave.' How many guards are knights?

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Two Doors

You stand before two doors. One leads to freedom, one to doom. Two guards stand watch — one always tells the truth (knight), one always lies (knave). You don't know which is which. You can ask ONE guard ONE question. What do you ask?

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A, B, and C

Three people A, B, C are either knights (always true) or knaves (always lie). A says: 'We are all knaves.' B says: 'Exactly one of us is a knight.' What are A, B, and C?

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What Am I?

A person says: 'I am a knave.' Is this person a knight or knave?

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