Which formula can be used to find the n th term of a geometric sequence where the first term is 8 and the common ratio is negative 3 ?

For a geometric sequence, the nth term is aₙ = a₁rⁿ⁻¹. Substituting the first term 8 and common ratio −3 gives aₙ = 8(−3)ⁿ⁻¹, which is choice C. The exponent is n − 1, so choice B would not give the correct first term when n = 1.

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