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Minimum number of colors required for proper edge coloring of a graph is called?

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Minimum number of colors required for proper edge coloring of a graph is called?

(a) Chromatic color

(b) Chromatic index

(c) Edge matching

(d) Color number

The question was asked by my college professor while I was bunking the class.

Question is taken from Graph Coloring in chapter Graph Coloring of Data Structures & Algorithms II

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Correct option is (b) Chromatic index

The explanation is: The minimum number of colors required for proper edge coloring of graph is called chromatic index. It is also known as edge chromatic number.

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