How many vertices in the graph below have even valences?

Name: How many vertices in the graph below have even valences?
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Question

Quizplus · Accepted Answer

To determine the valence of a vertex, we count the number of edges that are incident to it. In this graph, we can see that the vertices with even valences are the ones with 0, 2, 4, or 6 incident edges. Counting the number of such vertices, we get a total of 5, so the answer is B) 5.

How Many Vertices in the Graph Below Have Even Valences