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# Graph Theory

Any connected group of things can be represented as a graph: cities and roads, people and friendships, and more. Learn why an even number of people have an odd number of friends.

In the graph above, is it possible to trace a path from node 4 to node 6?

In the graph above, is is possible to trace a path from node 5 to node 4 that uses 3 or fewer edges?

How many paths are there between node number 9 and node number 7?

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