Data Structures · Question 24 · Medium
An undirected simple graph has 6 vertices whose degrees are 3, 3, 2, 2, 2 and 4. How many edges does the graph have?
- 16
- 8
- 9
- 6
Answer and explanation
Answer: B. 8
Explanation: Each edge adds 1 to the degree of both its endpoints, so the sum of degrees is twice the number of edges. The sum is 16, so there are 16 / 2 = 8 edges.
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