Let Gn be the complete bipartite graph K13, 17 then the chromatic number of G̅n is _____ (G̅n is complement of Gn and n = 30)

1
13
2
17
3
\(\frac{{n\left( {n - 1} \right)}}{2} - 13 \times 17\)
4
\(\frac{{n\left( {n - 1} \right)}}{2} - 2\)

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