3 × 9 ^ n × 27 ^ n-1 = 3 x 3 ^ 2n x 3 ^ (3n-3)

∵9=3^2 27=3^3
∴3×9^n×27^n-1
=3×(3^2)^n×(3^3)^n-1
Then the power above 3 is multiplied by the power outside the brackets to merge
=3 x 3^2n x 3^(3n-3)

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