First of all, we need to be clear about the goal of the problem. Then, we start from the goal and think backwards to find out the conditions or steps that need to be met to achieve this goal. These conditions or steps are the problems we need to solve.
For example, we ask to solve the general term formula of a series. We can start with the last term of the series, find out the relationship between them by observing the first few terms of the series, and then deduce the general term formula of the series. This is the application of backward induction.
When using backward induction, it should be noted that this method is not suitable for all problems. Some problems may need us to solve in other ways. In addition, backward induction requires us to have certain logical thinking ability and mathematical knowledge in order to effectively apply this method.
Generally speaking, backward induction is a very effective method to solve mathematical problems. It can help us to deduce the solution to the problem from the result of the problem. However, when we use this method, we need to pay attention to its scope of application and usage.