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A polytree is called _______________(a) directed acyclic graph(b) directed cyclic graph(c) bipartite graph(d) connected graphThe question was posed to me in a job interview.My question is taken from Properties of Tree topic in chapter Trees of Discrete Mathematics

Answer»

Correct option is (a) directed acyclic graph

The explanation: A directed acyclic graph is KNOWN as a POLYTREE whose underlying UNDIRECTED graph is a tree. In other words, a directed tree is a directed graph which WOULD be tree if the directions on the EDGES were ignored.



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