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Question

Let w be the minimum weight among all edge weights in an undirected connected graph. Let e be a specific edge of weight w. Which of the following is FALSE?


A
If e is not in a minimum spanning tree T, then in the cycle formed by adding e to T, all edges have the same weight
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B
Every minimum spanning tree has an edge of weight w
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C
e is present in every minimum spanning tree
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D
There is a minimum spanning tree containing e
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Solution

The correct option is C e is present in every minimum spanning tree
W be the minimum weight among all edge weigts in an undirected connected graph.

e is the specific edge of weight w. It may be possible that another edge in the graph having weight w which had been added to minimum spanning tree and when we add e to minimum spanning tree it form a simple circuit.

So we can't include e in every minimum spanning tree.

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