Cycles in a graph

The _____ of a graph G consist of all vertices and edges of G
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A given connected graph G is a Euler Graph if and only if all vertices of G are of
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A ____ in a graph G is a circuit which consists of every vertex(except first/last vertex) of G exactly once
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Let a graph cab ne denoted as bcdefb a kind of ____
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How many edges are there in a complete graph of order 9?
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In a directed graph with 6 vertices, what is the maximum possible number of edges?
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What is the chromatic number of a complete bipartite graph K3,4?

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In a simple connected planar graph, if f is the number of faces, e is the number of edges, and v is the number of vertices, what is the value of f - e + v?

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What is the minimum number of edges that must be removed from a complete graph K8 to make it planar?

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In a tournament graph with 7 vertices, what is the minimum possible number of vertices with a directed path of length 2 to every other vertex?

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What is the independence number of the Petersen graph?

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