A tree of a network graph consists of

A tree of a network graph consists of (A) (n-1) nodes (B) n branches (C) one or two nodes left in isolated position (D) no closed paths 
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imageThe dual of a tree is sometimes called a maze Itconsists of spaces connected by links in the same way that the tree consists of nodes connected by treebranches. Duals cannot be formed for every graph. ... Consequently, only planar graphs have duals.

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