6 10. The graph below shows the airfare between cities. Use the brute force method to find the cheapest way to visit all cities and return to NY if you lived in NY. a) How many unique Hamilton circuits does this graph contain? b) Give the cost of each circuit. c) Give the least expensive circuit. Seattle $119 $429 Phoenix $409 $389 $379 $319 $309 New Orleans $229 Boston $109 New York