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A graph with n nodes is connected, undirected, and acyclic. How many edges must it have? (Select ...

A graph with n nodes is connected, undirected, and acyclic. How many edges must it have? (Select the answer from the following options and prove your choice):

a) n

b) n*(n-1)

c) n- 1

d) n/2 - 1

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Answer #1

The correct answer is option c i.e. n-1. The reason behind this is that, a connected undirected graph with n nodes and without any cycle is a tree and a tree over n vertices always has n-1 edges.

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