Discrete Mathematics

Question

Each inhabitant of a remote village always tells the truth or always lies. A

villager will give only a "Yes" or a "No" response to a question a tourist asks.

Suppose you are a tourist visiting this area and come to a fork in the road. One

branch leads to the ruins you want to visit; the other branch leads deep into

the jungle. A villager is standing at the fork in the road. What one question

can you ask the villager to determine which branch to take?

Answer 1

"If somebody asked you whether this road leads to the ruins, would you say yes"?

Even if he is a liar he would give the correct answer, because he would lie

about what he would hypotactically say.