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Simplify frac 3 n - 1 times 27 n 1 81 n - WAEC Mathematics 2016 Question

Simplify; (\frac{3^{n - 1} \times 27^{n + 1}}{81^{n}})

A
32n
B
9
C
3n
D
3n + 1
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Correct Option: B

(\frac{3^{n - 1} \times 27^{n + 1}}{81^{n}})

= (\frac{3^{n - 1} \times 3^{3(n + 1)}}{3^{4n}})

= 3(^{n - 1 + 3n + 3 - 4n})

= 3(^{4n - 4n - 1 + 3})

= 32

= 9

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