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並前往https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:sequences/x2f8bb11595b61c86:introduction-to-arithmetic-sequences/v/arithmetic-sequences

Intro to arithmetic sequences | Algebra (video) - Khan Academy

In the context of a recursive formula where we have "n-1" in subindex of "a", you can think of "a" as the previous term in the sequence.

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