If $a \star b = \dfrac{\left(\dfrac{1}{b} - \dfrac{1}{a}\right)}{(a - b)}$, express $3 \star 11$ as a common fraction.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
If $a \star b = \dfrac{\left(\dfrac{1}{b} - \dfrac{1}{a}\right)}{(a - b)}$, express $3 \star 11$ as a common fraction.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
\frac{1}{33}
If $a \star b = \dfrac{\left(\dfrac{1}{b} - \dfrac{1}{a}\right)}{(a - b)}$, express $3 \star 11$ as a common fraction.
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