## THE MOTOR-CAR TOUR.

(

Unicursal and Route Problems)

In the above diagram the circles represent towns and the lines good

roads. In just how many different ways can a motorist, starting from

London (marked with an L), make a tour of all these towns, visiting

every town once, and only once, on a tour, and always coming back to

London on the last ride? The exact reverse of any route is not counted

as different.

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