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bₙ = b₁ · qⁿ⁻¹ — formulas, examples, and an interactive trainer.
A sequence where each term is obtained by multiplying the previous term by a constant q (the common ratio).
bₙ = b₁ · qⁿ⁻¹. For example: b₁=2, q=3 → b₄=2·3³=54.
In an arithmetic progression there is a constant difference d. In a geometric progression there is a constant common ratio q (the ratio of consecutive terms).