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Concept

Collinear

Any set of two or more points that lie on the same line are said to be collinear.

In this illustration, $A,$ $B,$ and $C$ are all considered to be collinear. In contrast, $D$ does not lie on the same line as the other points.

However, since any two points can be used to define a line,

D

is still considered to be collinear with the other points individually. Therefore, there are four sets of collinear points on the graph.

{A, B, C} {A, D} {B, D} {C, D}

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