Each edge of a cube is coloured either red or
black. If every face of the cube has at least one
red edge, then the smallest possible number of
red edges is
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Each edge of a cube is coloured either red or
black. If every face of the cube has at least one
red edge, then the smallest possible number of
red edges is
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The total faces is 6
Each faces had 4 edges but not unique edges.
since edges are shared with one other face 6*4= 24
therefore 24/2 = 12 unique edges.
so at least one of the four edges is black.