Explanation and example usage of php proportional sequence
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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.
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