Which of the following statement is not true regarding graph?
A
A graph consists of a set of nodes and a set of arcs
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B
A graph is a tree
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C
A tree is a graph
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D
Graphs can be directed
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Solution
The correct option is C A tree is a graph In mathematics, in graph theory, a tree is an undirected graph in which any two vertices are connected by exactly one path. Every acyclic connected graph is a tree. A forest is a disjoint union of trees, or equivalently an acyclic graph that is not necessarily connected.