$${\text{If}}\,{\kern 1pt} {\left( {\frac{a}{b}} \right)^{x

Question

$${\text{If}}\,{\kern 1pt} {\left( {\frac{a}{b}} \right)^{x - 1}} = {\left( {\frac{b}{a}} \right)^{x - 3}},$$ then the value of x is

Options:

A . $$\frac{1}{2}$$

B . 1

C . 2

D . $$\frac{7}{2}$$

Answer: Option C

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