Three people, Al, Bob, and Cary, are standing together at the mall. Al says, All of us

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Three people, Al, Bob, and Cary, are standing together at the mall. Al says, “All of us are knaves,” and Bob says, “Exactly one of us is a knight.” What are all three?

In a certain kingdom, there were knights and knaves. The knights always tell the truth and the knaves always lie. Everyone in the kingdom is either a knight or a knave. Use this information to answer the questions in Problems 21–24.

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