It's very simple, assuming that the first person has no hair, the second person has one, and the third person has two ... and so on, it is generally believed that the total hair of normal adults is between 80,000 and 654.38+10,000. Even if someone is 200 thousand longer than b t, it can be ruled out. After all, we are talking about the majority. Well, assuming that no one can surpass 0.2 million/200 thousand, let's say the 2000 th. Then the number of other people (65.438+0.3 billion minus 20,0001) can only be between 65.438+0 and 200,000, so there are more than two people with the same number.