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2. Consider the following graph C with solid and dotted edges: The solid edges f

ID: 3762158 • Letter: 2

Question

2. Consider the following graph C with solid and dotted edges: The solid edges form a spanning tree T of graph G. Each of the solid edges has a weight. Assign weights to the dotted edges, (1,2), (2,3), (4,5), (3,6) and (4,7), such that: Each of the edge weights is a positive INTEGER; Tree T is a MINIMUM spanning tree of G and NO other tree is a MINIMUM spanning tree of G; Each of the edge weights of the dotted edges is as small as possible. For instance, if you assign the edge weight 1 to edge (2,3), then replacing edge (3,5) in T with edge (2,3) will give a spanning tree with less weight than T. Thus edge (2,3) must have a weight greater than 1. if you assign the edge weight 3 to edge (2,3), then replacing edge (3,5) in T with edge (2,3) will give a different spanning tree with weight equal to T. This new tree would also be a minimum spanning tree. Thus edge (2,3) must have a weight greater than 3.

Explanation / Answer

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