8.2. A boy always lies on Tuesdays, and tells the truth only on Thursdays and Fridays. One day, he was asked his name for six days in a row. The answers were as follows: Kolya, Petya, Kolya, Petya, Vasya, Petya. What is the boy's name?
Answer: Kolya. Since among the boy's answers there are no two identical ones in a row, he either started answering on Friday or finished on Thursday. But the latter is impossible, because the boy cannot give the same answers on Tuesday and Thursday. Therefore, he started answering on Friday and told the truth.