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This article introduces the knowledge of "the explanation and example usage of php proportional series". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Description:

1. Proportional series refers to a series in which the ratio of each term to its previous term is equal to the same constant from the second term, which is often expressed by G and P.

2. This constant is called the common ratio of a proportional sequence, which is usually expressed by the letter Q (Q ≠ 0).

The proportional sequence A1 ≠ 0. Each item in {an} is not 0. Note: when Qroom1, an is a constant column.

Example

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