Problem
COM-B1-M04-P017 Segments Between Points
#17
★★★☆☆ Level 3 of 5
There are \(12\) marked points in the plane, no three collinear. How many segments with endpoints among the marked points can be drawn?
A segment is determined by a pair of points.
Choose \(2\) points out of \(12\). This gives \(12\cdot11/2=66\) segments.
Simple geometric incidence.