GRE
The probability that neither E nor F will occur
0.5
$$\frac{8^28^{-4}}{8^3}$$
$$\frac{1}{2^{15}}$$
$$x^{-10}$$
$$x^{-20}$$
Twice the sum of the interior angles of polygon P
The sum of the interior angles of polygon Q
$$\sqrt{r^6}$$
$$r^3$$
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