12. Graph Theory

Using the graph below, determine if the sequence of vertices describes an Euler path (E.P.), an Euler circuit (E.C.), or neither.

$P,Q,R,S,T,U,P$

Using the graph below, determine if the sequence of vertices describes an Euler path (E.P.), an Euler circuit (E.C.), or neither.

$P,Q,T,S,R,U,P$

Using the graph below, determine if the sequence of vertices describes an Euler path (E.P.), an Euler circuit (E.C.), or neither.

$Q,U,P,Q,T,S,R,U$