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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.

Trees

True or false: any tree is connected.

A tree has 10 vertices. How many different possibilities are there for the number of edges that it can have?

Is this graph a tree?

Define the distance between two nodes to be the number of edges in the shortest path between them. Define the width of a tree to be the largest distance between any two nodes. What's the smallest possible width of a tree with 63 nodes?

Is this graph a tree?

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