How many closed polygons will $n$ coplanar lines, all intersecting each other (no three concurrent), form on the plane?
Can we find a recursion formula for this?? Is there a way out?
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I have edited it.. – Ryan Scott Mar 02 '18 at 04:00
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It is no more a duplicate problem.. – Ryan Scott Mar 02 '18 at 04:01
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Is it $\frac{n^2-3n+2}{2}$ ?? – Of course it's not me Mar 02 '18 at 04:02
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How did you get it? – Ryan Scott Mar 02 '18 at 04:09