For a given positive integer n>2, let C1,C2,C3 be the boundaries of three convex n− gons in the plane , such that
C1∩C2,C2∩C3,C1∩C3 are finite. Find the maximum number of points of the sets C1∩C2∩C3. floor functiongeometrygeometric transformationrotationcombinatorial geometrycombinatorics unsolvedcombinatorics