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
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.