All people in a certain 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 knights”, 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