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Given $f(x)$ is a polynomial of $n$th degree and

$\large \lim_{x \to 0} \frac{2^{r-1}(x-2)f(x)-x^{r}+2^{r}}{x^{r}(x-2)}=\frac{1}{2} \quad \forall r \in \mathbb N \cap [1,n]$

Find $\displaystyle \lim_{n \to \infty}f(1)$.

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