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What will be the chromatic number for a line graph having n vertices?

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What will be the chromatic number for a line graph having n vertices?

(a) 0

(b) 1

(c) 2

(d) n

I had been asked this question in a national level competition.

Asked question is from Graph Coloring in section Graph Coloring of Data Structures & Algorithms II

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Right option is (d) n

For explanation: A line graph of a simple graph is obtained by connecting two vertices with an edge. A line graph has a chromatic number of n.

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