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will be 12 + 20 + 10 = 42. Special Graphs : Trees : Tree Graph A tree is an undirected graph with no cycle. It is connected with ‘N’ number of nodes and ‘N-1’ of edges. Where ‘N’ can be any number. Let’s say : A tree graph has N (nodes) where ‘N’ : 100 then it will be connected with ‘N-1’ edges