Answer
a) no.
Work Step by Step
a) The graph does not have Hamilton circuits, because for that no vertex can have a degree less than $2$, which here is not the case.
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 14 - Graph Theory - 14.3 Hamilton Paths and Hamilton Circuits - Exercise Set 14.3 - Page 921: 9
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