Question

Двое из ларца одинаковы с лица: один — Пётр, другой — Павел. Один из них всегда говорит правду, а другой всегда лжёт. Вы можете задать только один вопрос одному из двоих , на который он ответит «да» или «нет». Попробуйте выяснить как зовут каждого из них.

Answer 1

The Riddle of the Two Men

In this riddle, there are two men who look identical: one is named Peter and the other is named Pavel. One of them always tells the truth, while the other always lies. You are allowed to ask only one question to one of the two men, and they can only respond with "yes" or "no." Your task is to determine the names of each man.

To solve this riddle, you can ask one of the men a question that will help you identify the other man. One possible question you can ask is: "If I were to ask the other man which one of you is Peter, what would he say?"

Let's consider the two possible scenarios:

1. If you ask the truthful man, Peter, he will honestly answer based on what the lying man, Pavel, would say. Since Pavel always lies, Peter would say that Pavel would point to himself as Peter. Therefore, the truthful man would answer "yes."

2. If you ask the lying man, Pavel, he would lie about what the truthful man, Peter, would say. Since Peter always tells the truth, Pavel would say that Peter would point to himself as Peter. Therefore, the lying man would also answer "yes."

In both scenarios, regardless of whom you ask, the answer will be "yes." This means that the person you asked is Pavel, the liar. Therefore, the other person must be Peter, the truthful man.

So, based on this question and the "yes" response, you can conclude that the person you asked is Pavel, and the other person is Peter.

Please note that the specific sources provided by You.com did not contain direct information about this riddle. The solution provided is a well-known logical approach to solving this type of riddle.