Explain why there can't be a simple graph with the following sequence of vertex degrees: (a) 5,1,1,1
1 answer:
Answer:
a cant exist because 3 out of the 4 vertices must have only one degree vertex and the remaining one must have 5.
b) This example can be a single graph because of the handshaking lemma. The sum of the odd degrees vertex must be an even number: 3+3+5=11
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