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Another graph type worth mentioning is a tree graph.

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A tree graph has two properties.

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The first property is that the graph must be connected,

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and the second property is that the graph doesn't have any cycles or loops.

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The best way to understand what a true graph is is to see some examples.

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So, let's have a quiz.

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Here are 8 graphs. For each graph, I want you to check the box if it's a tree.