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Q)

If $ A=\{x:x\in R\:and\:x\geq 1\}$ and $ f:A\rightarrow A$ is defined as $f(x)=2^{x(x-1)},$ then find $ f^{-1}(x).$

(A) $\large\frac{1+\sqrt{1+4log_2x}}{2}$

(B) $\large\big(\frac{1}{2}\big)^{x(x-1)}$

(C) $\large\frac{1-\sqrt{1+4log_2x}}{2}$

(D) none of these

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