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Question

Let G be an undirected connected graph with distinct edge weights.

Let emax be the edge with maximum weight and emin be the edge with minimum weight.

Which of the following statements is false?

A
No minimum spanning tree contains emax
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B
G has a unique minimum spanning tree
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C
If emax is in a minimum spanning tree, then its removal must disconnect G
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D
Every minimum spanning tree of G must contain emin
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Solution

The correct option is C If emax is in a minimum spanning tree, then its removal must disconnect G
All edges are distinct weights.
Removal of emax may not disconnect G, because other edges may cover the vertices incident with emax

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