If there are four lines in a plane then what cannot be the number of points of intersection of these...........

Quantitative Aptitude (CGL) Coordinate Geometry

If there are four lines in a plane, then what cannot be the number of points of intersection of these lines?

Maximum number of intersection points of nn lines =n(n-1)/2
Thus, in a plane of 4 lines, maximum intersection points=4x3/2=6
=>7 is not possible

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