Solution

ID: past-exam-of-the-probability-statistics-and-options-ii-course-of-the-university-of-oxford/2008/r/2/iv/e/solution

No. At any cube vertex its three incident faces are pairwise adjacent along the three incident edges. They would therefore require three different colours. Equivalently the dual of the planar cube embedding contains a triangle, which obstructs a face two-colouring.

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