Problem $3\mathrm{.}4$

Use Theorem $3\mathrm{.}2$ to determine which of the following graphs are Eulerian:

$($a$)$ the complete graph $K_8$;

$($b$)$ the complete bipartite graph $K_{8,8}$;

$($c$)$ the cycle graph $C_8$;

$($d$)$ the dodecahedron graph;

$($e$)$ the cube graph $Q_8.$ us questions ko proper graph kKi example de kar samjya