Henry Ernest Dudeney/Puzzles and Curious Problems/267 - A Motor-Car Tour

by : $267$

 * A Motor-Car Tour
 * A man started in a motor-car from town $A$, and wished to make a complete tour of these roads,''
 * ''going along every one of them once, and once only.


 * Dudeney-Puzzles-and-Curious-Problems-267.png


 * How many different routes are there from which he can select?


 * Every route must end at the town $A$, from which you start,
 * and you must go straight from town to town -- never turning off at crossroads.