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Ques : What is Edge Colouring ?

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Definition: A k-edge colouring of a graph G is an assignment of k colours to the edges of G in such a way that no two edges incident with the same vertex have the same colour. A graph is k-edge colourable if it has a k-edge colouring. The minimum number of colours required to colour the edges of a graph is called the edge chromatic number of G, usually denoted by χ'(G).

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