GRE
2r
$$\frac{1}{r}$$
The number of points (a, b) on circle C where both a and b are integers
The number of points (a, b) on circle D where both a and b are integers
The length of a diagonal of square T
The length of a side of square S
$$\frac{1}{x}+\frac{2}{x}+\frac{3}{x}$$
$$x+\frac{x}{2}+\frac{x}{3}$$
The probability that a total of 3 balls will be selected
The probability that a total of 4 balls will be selected
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