How many edges does the complete graph K5 have?
Answer and explanation
Correct answer: B. 10
- Step 1: Each pair of vertices is joined by one edge. Step 2. C(5, 2) = 10. Answer: 10. Why not the others: 20 is what you get if you count each edge twice. 5 is what you get if you count one edge per vertex. 4 is what you get if you give the edges of a tree.
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