What is the value when n=5 in the geometric sequence a_n=4⁢(3)^n−1 ?

The formula is aₙ = 4(3)ⁿ⁻¹, so substitute n = 5: a₅ = 4 × 3⁽⁵⁻¹⁾ = 4 × 81 = 324. The correct choice is 324.

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