GRE
$$\frac{1}{3^{n}}$$
$$3(\frac{1}{4^{n}})$$
$$\frac{1}{x}$$
$$\frac{1}{y}$$
a+1
$$\frac{1}{a}$$ - 1
|1-x|
1
The number of positive even integers less than 100, each of which is the square of an integer
The number of positive odd integers less than 100, each of which is the square of an integer
The number of points with equal distance from three lines
3
The perimeter of the triangle
15
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