According to the content of the topic, list all the possibilities one by one, so as to get the result of this topic. For example, what number is required to be greater than 1 less than 5? The enumeration method is 2.3.4.

This method is often used in solving mathematical problems, but when using enumeration method, we should pay attention to the importance and omission, and think methodically. In other words, in the process of listing all the possibilities, we should try to think in an orderly way, from small to large, from large to small, and write all the possibilities one by one. In the process of writing, we should try our best not to repeat or omit, so as to ensure the completeness and accuracy of the answers.

This method can be intuitive and clear in the process of doing problems, and see all the possibilities, thus reducing the difficulty of solving problems and solving related problems better.