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An Introduction To English Grammar And Languages
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  1. All people in a certain island are either 'Knights' or 'Knaves' and each person knows every other person's identity. Knights NEVER lie, and knaves ALWAYS lie. P says 'Both of us are knight'. Q says 'None of us are knaves' Which one of the following can be logically inferred from the above?
    1. Both P and Q are knights
    2. P is a knight; Q is a knave
    3. Both P and Q are knaves
    4. The identities of P, Q cannot be determined
Correct Option: D

Both P and Q can either be knights or knaives i.e. either truth tellers or liers. Hence, we cannot determine the right answer.


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