GRE
y
21
$$f(3)$$
$$f(9)$$
$$\frac{2y+3}{x}$$
$$\frac{a}{x}$$
$$x+y+z+u+v+w$$
$$360$$
The median of the $$2n+1$$ measures of the interior angles of $$P$$ and $$Q$$
$$(\frac{n-1}{n+1})180°$$
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