There is only one line (or line segment) that can be drawn between two distince points.
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Use the formula n(n-1)/2 --> 7(7-1)/2 = 7(6)/2 = 42/2 = 21.
there are infinitely many segments in a line.
Line segments are lines so the answer is 3.
A circle does not have line segments. It is a continuous curve.