Easy -1.8 This is a straightforward recall question requiring only recognition of the definition of semi-Eulerian (exactly two odd vertices). No calculation or problem-solving is needed—just visual inspection of vertex degrees and applying a memorized criterion.
Which one of the graphs shown below is semi-Eulerian?
Tick ($\checkmark$) one box.
[1 mark]
\includegraphics{figure_3}
\hfill \mbox{\textit{AQA Further AS Paper 2 Discrete 2024 Q3 [1]}}