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What is the chromatic number of compliment of line graph of bipartite graph?

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in Data Structures & Algorithms II by (687k points)
What is the chromatic number of compliment of line graph of bipartite graph?

(a) 0

(b) 1

(c) 2

(d) 3

please answer, I need the answer asap.

1 Answer

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Best answer
Right option is (c) 2

The best I can explain: The perfect bipartite graph has chromatic number 2. So the Compliment of Line Graph of Bipartite Graph, Compliment of Bipartite Graph, Line Graph of Bipartite Graph and every Bipartite Graph has chromatic number 2.

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