(10pts) 4. Answer the following: (a) What is the largest value of n for which the complete bipartite graph K6,n is planar? (b) How many vertices are there in a connected planar simple graph with 12 regions and 20 edges? Show transcribed image text (10pts) 4. Answer the following: (a) What is the largest value of n for which the complete bipartite graph K6,n is planar? (b) How many vertices are there in a
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