Person X says: 'At least one of us is a Knave.' If Knights always tell the truth and Knaves always lie, what are Person X and his companion Y?
Options:
(A) X is a Knight and Y is a Knave.
(B) Both are Knights.
(C) Both are Knaves.
(D) X is a Knave and Y is a Knight.
Answer Key:
A
Step-by-Step Solution & Explanation
If X were a Knave, his statement would be false (implying neither is a Knave, so both are Knights, contradicting that X is a Knave). Thus X is a Knight, his statement is true, and Y must be the Knave.