What is the rule for the geometric sequence shown?1, 2, 4, 8 …

A geometric sequence has a constant ratio between consecutive terms. Here, each term is multiplied by 2, and the first term is 1. Using the formula aₙ = a₁rⁿ⁻¹ gives aₙ = 1(2)ⁿ⁻¹, which is choice C, aₙ = (2)ⁿ⁻¹.

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