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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 $$n$$ lines = $$\frac{n(n-1)}{2}$$
Thus, in a plane of 4 lines, maximum intersection points = $$\frac{4\times3}{2}=6$$
=> 7 is not possible.
=> Ans - (D)
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