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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 while $D$ 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 $4$ sets of collinear points on the graph. \begin{aligned} &\{A,B,C\}\\ &\{A,D\}\\ &\{B,D\}\\ &\{C,D\} \end{aligned}