Editor
Evaluate $\mathop {\lim }\limits_{x \to 6} \left( {\frac{{\sqrt x - \sqrt 6 }}{{x - 6}}} \right)$:
Difficulty: Easy
A: 
0
B: 
$\sqrt{6}$
C: 
$\frac{1}{2\sqrt{6}}$
D: 
Limit does not exist
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