Determine, by distance formula, whether the points are collinear or not
(i) (1, 2), (5,3) and (18,6)
(ii) (4,3), (5, 1) and (1,9)
(iii) (2,5), (-1,2) and (4,7).
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Three or more points are collinear, if slope of any two pairs of points is same. With three points A, B and C, three pairs of points can be formed, they are: AB, BC and AC. If Slope of AB = slope of BC = slope of AC, then A, B and C are collinear points.
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