Question

given n points in space no three of which are collinear and no four coplanar, for what value of no will the number of straight lines be equal to the number of planes obtained by connecting these points?​

Answer 1

Answer:

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

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