The truth teller would tell the truth and point you to the door to freedom. The liar would lie about what s/he would say if you asked him or her. If you did ask him or her, s/he would tell you the door to death, so s/he lies about this and also points you towards the door the freedom.
How do you respond to a liar?
Here are 10 strategies for detecting and responding to lying:
- Love truth.
- Forget body language – focus on the words.
- Tell them you value honesty.
- Observe what happens when details are questioned.
- Ask open-ended questions.
- Don’t let on that you know they’re lying.
- Watch for the evidence of patterns of dishonesty.
Are there two doors with two guards and one lies?
One of the guards always tells the truth and the other always lies. You don’t know which one is the truth-teller or the liar either. You have to choose and open one of these doors, but you can only ask a single question to one of the guards. What do you ask so you can pick the door to freedom?
Which is the door that leads to life?
You would ask: “If I were to ask the other guard which door leads to life, what would he say?” The guard that tells the truth knows that the other guard would lie. So he tells the truth and points to the door that leads to death. The guard that lies knows that the other guard would tell the truth.
Which is door leads to death, one leading to freedom?
One leading to death, one leading to freedom. There are two soldiers, each one guarding one door. One of the guards is a perfect liar, the other one will always tell the truth. The man is allowed to ask one soldier one yes-no question and then has to decide, which door to take. Which one question can he ask to find the door to freedom?
What happens if you point to the door to death?
If the guard is a liar, the number of truths is odd, 1. is true, 2. is true, so 3. must be true. So regardless of the answer of the guard, the door you pointed at is the door to freedom, you can leave safely. What happens if you point to the door to death? – Rob Watts Sep 20 ’14 at 18:57 Fantastic!