It is proved that the remainder of any two numbers divided by 3 is equal, and the difference between these two numbers must be a multiple of 3.

The remainder is divided by 3 * * *: 0, 1, 2, 3.

4/3= 1…… 1

Think of four numbers as four apples, and divide three remainders into three drawers.

According to the pigeon hole principle, there must be two apples in the drawer.

In other words, there must be two numbers divided by three and the remainder is the same.

That is, any four natural numbers, in which the difference between at least two numbers is a multiple of three.

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