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Let K n K_n Kndenote the complete graph with n n nvertices. Which of the following is true?
我。 K 4 \hspace{1mm} K_4 K4is planar.II. K 5 \hspace{1mm} K_5 K5is planar.III. K 6 \hspace{1mm} K_6 K6is planar.
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