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IKMC 2020 - Grades 5-6 - Set 2 - Self-study Question 13

IKMC · IKMC 2020 - Grades 5-6 - Set 2 - Self-study

Question 13

An elf and a troll meet. The troll always lies, while the elf always tells the truth. They both say exactly one of the following sentences: which one?
  1. I am telling the truth.
  2. You are telling the truth.
  3. We both are telling the truth.
  4. I always lie.
  5. One and only one of us is telling the truth.