In mathematics, why learn series? That is, what is the significance, nature and category of sequence in mathematics? . . . . . .

The learning order is to lay the foundation for future limits.

It can be described by the changing law of data. Learning the series helps you to have some intuitive understanding of the future changes of the obtained data, such as a arithmetic progression, so that you can predict the future changes of the data and decide what good measures should be taken.

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