GRE
The number of the subsets of $$S_8$$
The number of the subsets of $$S_9$$ that contain the integer $$9$$
x
y
($$\frac{2}{3}$$@$$\frac{2}{3}$$)@$$\frac{2}{3}$$
$$\frac{2}{3}$$@($$\frac{2}{3}$$@$$\frac{2}{3}$$)
y+z
The time it took car G to travel x miles at the average rate of y miles per hour
The time it took car H to travel w miles at the average rate of z miles per hour
The area of region ABD
The area of region ACD
$$(\frac{1}{2})^{n}$$
$$(\frac{1}{3})^{n}$$
$$|a-b|$$
$$3$$
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