Back to the 2022 paper

Module 5: Graphs and Trees

20222m

An undirected graph has 8 vertices labelled 1,2,,81, 2, \dots, 8 and 31 edges. Vertices 1,3,5,71, 3, 5, 7 have degree 8 and vertices 2,4,6,82, 4, 6, 8 have degree 7. What is the degree of vertex 8?

(i) 15
(ii) 8
(iii) 5
(iv) 23

Similar questions