Question: 8.18 ( ) www Show that a distribution represented by a directed tree can trivially be written as an equivalent distribution over the corresponding undirected

8.18 ( ) www Show that a distribution represented by a directed tree can trivially be written as an equivalent distribution over the corresponding undirected tree. Also show that a distribution expressed as an undirected tree can, by suitable normalization of the clique potentials, be written as a directed tree. Calculate the number of distinct directed trees that can be constructed from a given undirected tree.

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