There are 10 points in a plane, no three of which are in the same straight line, excepting 4 points, which are collinear. Find the the number of straight lines obtained from the pairs of these points.
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As it is given 4 points are collinear out of 10 points.
The no.of straight lines obtained from the 10 points = 10C2 - 4C2+1 = 45-6+1 = 40
The no.of straight lines obtained from the 10 points = 10C2 - 4C2+1 = 45-6+1 = 40
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