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Puzzling

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    $\begingroup$ "all pairs of red and blue points" - does this include red-red, blue-blue and red-blue, or only red-blue? $\endgroup$ Commented Apr 9, 2016 at 16:48
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    $\begingroup$ @astralfenix: "all pairs of red and blue points" only includes red-blue (but not red-red and blue-blue). $\endgroup$ Commented Apr 9, 2016 at 17:00
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    $\begingroup$ Are the points allowed to coincide? $\endgroup$ Commented Apr 9, 2016 at 17:07