GRE
|-M| - |-N|
|-N| - |-M|
The number different line segments that can be formed when connecting 6 different points on a circle
15
The number of people at the party
8
$$x^{2}$$+$$y^{2}$$
$$1$$
$$\frac{111}{1,111}$$
$$\frac{1,111}{11,111}$$
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