Series can produce multiple-choice questions or answers, and the proportion of series surveys and answers in most areas is relatively large. Generally speaking, we will study the general formulas of arithmetic progression and geometric progression, the ingenious application of the first n summation formulas, and some common properties of arithmetic progression and geometric progression. As long as you master the nature of this part, then this part of the small problem is not difficult. Below, I will focus on the investigation questions and problem-solving skills.

There are generally two kinds of problems in the investigation of sequence, one is to find the general term formula of sequence, and the other is to find the sum of the first n terms of sequence. Next, I will focus on analyzing the test sites for finding the general formula of series.

The above are several common problems and solutions to find the general formula of series, hoping to help you prepare for the exam.

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