Question: (a) show briefly that, in a directed acyclic graph, the nodes can be numbered in such a way that an arc from node I to
(a) show briefly that, in a directed acyclic graph, the nodes can be numbered in such a way that an arc from node I to node j implies that I Please post full and detailed solutions. This is a past paper question for which no mark scheme has been given. Thanks in advance :) 
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