The math problem of Eight Cherry is the principle of addition, subtraction, multiplication and division. There are n ways to do something and finish it. The first way has m 1 different ways, the second way has m2 different ways, and the nth way has mn different ways, so there are N=m 1+m2+m3+…+mn different ways to accomplish it.

In addition principle's principle of addition and multiplication, addition principle divided the methods to accomplish a thing into several categories, and any method in each category can accomplish the task, so the number of different methods to accomplish the task is equal to the sum of the numbers of various methods.

Briefly introduce other situations of addition and multiplication principles.

The application scope of addition principle's addition and multiplication principle: There are several ways to accomplish one thing, and any method in each category can accomplish the task. This problem can be solved by addition principle, which can be abbreviated as "additive classification, class independence".

The scope of application of the multiplication principle: this matter should be completed in several independent steps that do not affect each other. To accomplish this task, these steps are essential. This kind of problem can be solved by the principle of multiplication, which can be abbreviated as "step by step multiplication, step by step correlation"