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If chromatic number of a line graph is 4 then the chromatic index of the graph will be?

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in Data Structures & Algorithms II by (89.2k points)
If chromatic number of a line graph is 4 then the chromatic index of the graph will be?

(a) 0

(b) 1

(c) 4

(d) information insufficient

This question was posed to me during an interview.

The doubt is from Graph Coloring in section Graph Coloring of Data Structures & Algorithms II

1 Answer

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Best answer
Correct choice is (c) 4

For explanation: The chromatic index of a graph is always equal to the chromatic number of its line graph. So the chromatic index of the graph will be 4.

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