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QUESTION
Suppose that in a bipartite graph, all vertices except possibly one of them, have the same degree d, and the remaining vertex has an unknown degree x....
Suppose that in a bipartite graph, all vertices except possibly one of them, have the same degree d, and the remaining vertex has an unknown degree x. Prove that x must be a multiple of d (0, d, 2d, 3d, etc.).
