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IKMC 2007 - Grades 11-12 - Self-study Question 18

IKMC · IKMC 2007 - Grades 11-12 - Self-study

Question 18

An island is inhabited by knights, who always tell the truth, and liars, who always lie. Islander A says that at least one of A and B is a liar. Which statement is true?
  1. A cannot make that statement.
  2. Both are liars.
  3. Both are knights.
  4. A is a liar and B is a knight.
  5. B is a liar and A is a knight.