Saturday, 13 December 2014

limit of $log(x)^{(k+1)}/x$

$$ \lim_{x\to \infty} \left(\frac{\log^{k+1}(x)}{x}\right) = \lim_{x\to \infty} \left(\frac{\frac{(k+1)\log^{k}(x)}{x}}{1}\right) = \lim_{x\to \infty} \left(\frac{(k+1)(k)\log^{k-1}(x)}{x}\right) = \lim_{x\to \infty} \left(\frac{(k+1)!}{x}\right) \Rightarrow 0$$



I used L'Hospital to get to $$\lim_{x\to \infty} \left(\frac{(k+1)(k)\log^{k-1}(x)}{x}\right)$$



But from there I don't understand how to get $$ \lim_{x\to \infty} \left(\frac{(k+1)!}{x}\right) $$



Any help would be appreciated, thanks in advance.

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