1.

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 stranding at the fork in the road. What one question can you ask the villager to determine with branch to take?

"If I were to ask you whether the right branch leads to the ruins, would you answer yes?"

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 stranding at the fork in the road. What one question can you ask the villager to determine with branch to take?

"If I were to ask you whether the right branch leads to the ruins, would you answer yes?"

2

When three professors are seated in a restaurant, the hostess asks them: Does everyone want coffee? The first professor says" I do not know. The second professor then say: I do not know. Finally, the third professor says: No, not everyone wants coffee. The hostess comes back and gives coffee to the professors who want it. How did she figure out who wanted coffee?

Yes, Yes, No

When three professors are seated in a restaurant, the hostess asks them: Does everyone want coffee? The first professor says" I do not know. The second professor then say: I do not know. Finally, the third professor says: No, not everyone wants coffee. The hostess comes back and gives coffee to the professors who want it. How did she figure out who wanted coffee?

Yes, Yes, No

3

Suppose there are signs on the doors to two rooms. The sign on the first door reads "In this room there is lady, and in the other one there is a tigar"; and the sign on the second door reads "In one of these rooms, there is a lady, and in one of them there is a tigar" Suppose that you know that one of these sign is true and the other is false. Behind which door is the lady?

The 2nd door sign is true, making the 1st door's sign false. If the 1st door's sign were true then the 2nd door's sign would also be true (because in one room there is a lady & one a tiger).

Suppose there are signs on the doors to two rooms. The sign on the first door reads "In this room there is lady, and in the other one there is a tigar"; and the sign on the second door reads "In one of these rooms, there is a lady, and in one of them there is a tigar" Suppose that you know that one of these sign is true and the other is false. Behind which door is the lady?

The 2nd door sign is true, making the 1st door's sign false. If the 1st door's sign were true then the 2nd door's sign would also be true (because in one room there is a lady & one a tiger).