यदि \(f(x)=\dfrac{x}{x-1}\) का फलन f(3x) को f(x) के रूप में व्यक्त करता है तो

1
\(\dfrac{3f(x)}{2f(x)+1}\)
2
\(\dfrac{3f(x)}{3f(x)-1}\)
3
\(3f(x) - 1\)
4
\(\dfrac{3f(x)}{3f(x)-3}\)

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