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.

Answers (1)

Solution: 

As it is given 4 points are collinear out of 10 points.

The number of straight lines obtained from the 10 points =_2^10	extrmC-_2^4	extrmC+1=(45-6+1)=40

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