What is a chromatic number?

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The number of colors required for proper edge coloring of graph

The maximum number of colors required for proper vertex coloring of graph

The minimum number of colors required for proper vertex coloring of graph

The minimum number of colors required for proper edge coloring of graph

Explanation

The minimum number of colors required for proper vertex coloring of graph is called chromatic number whereas the minimum number of colors required for proper edge coloring of graph is called chromatic index of a graph.