Question: A certain graph is 19 vertices, 19 edges, and no circuits. Is it connected? Explain. A certain connected graph has 68 vertices and 72 edges.

A certain graph is 19 vertices, 19 edges, and no circuits. Is it connected? Explain. A certain connected graph has 68 vertices and 72 edges. Does it have a circuit? Explain. Explain why you cannot have a binary tree with a height of 4, and with 18 terminal vertices.

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