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The definition of a non-collinear line is that this is a line on which points do not lie on one line. The opposite of this is a collinear point. Collinear points refer to three points that do fall on a straight line.
two points form a line one more point is needed to check whether it is collinear or not so atleast three points must be require to check the non collinerancy of a points
yes
Collinear means they are on the same line. Of course we can draw a line through any two points so they can be collinear. However, if we have a line, we can easily find another point on that line and a point not on the line. Only the one on the line is called collinear.
Only one if they are non-collinear. An infinite number if they are collinear.