For \( x \in \mathbb{R}-\{0,1\} \), let \( f_{1}(x)=\frac{1}{x}, f_...

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For \( x \in \mathbb{R}-\{0,1\} \), let \( f_{1}(x)=\frac{1}{x}, f_{2}(x)=1-x \) and \( f_{3}(x)=\frac{1}{1-x} \) be three given functions. If a function, \( J(x) \) satisfies \( \left(f_{2} 0 J f_{1}\right)(x)=f_{3}(x) \) then \( J(x) \) is equal to :-
\( (1) f_{3}(x) \)
(2) \( f_{1}(x) \)
(3) \( f_{2}(x) \)
(4) \( \frac{1}{x} f_{3}(x) \)
\( \mathrm{P} \)
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