Use the figure to determine if each sequence of vertices represents an Euler trail or not. If not, explain why.

1. \(e \rightarrow f \rightarrow b \rightarrow a \rightarrow d \rightarrow c \rightarrow g \rightarrow h \rightarrow e \rightarrow d\)
2. \(d \rightarrow a \rightarrow b \rightarrow f \rightarrow e \rightarrow h \rightarrow g \rightarrow c\)
3. \(d \rightarrow a \rightarrow b \rightarrow e \rightarrow f \rightarrow b \rightarrow e \rightarrow d \rightarrow c \rightarrow g \rightarrow h \rightarrow e\)

Transcribed Image Text:

a b. Graph I