Simplify the following expression.
$9\frac{1}{5}÷\begin{Bmatrix}\begin{pmatrix}16\frac{1}{5}÷12\frac{2}{3}-9\frac{2}{3}\end{pmatrix}+17\frac{1}{2} \, of \, 3\frac{1}{21}\end{Bmatrix}$
Answer & explanation
Correct answer: option 4
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