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Product Law

81x-4=1 then ...

Question

$(81)^{x - 4} = 1$ then the value of $x$ is

A

2

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B

1

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C

4

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D

8

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Solution

The correct option is C $4$
Since, $(81)^{x - 4} = 1$
or, $(81)^{x - 4} = (81)^{0}$
or, $x - 4 = 0$
or, $x = 4$

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