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For the given graphs shown below which one is nonplanar graph?
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- (i) only
- (i) and (ii)
- (ii) only
- (iii) only
Correct Option: D
A given graph will be non-planar if it drawn on the sheet of paper with crossing lines, otherwise it will be planar. 
Figure (ii) can be treated as However the fig. (ii) cannot be drawn on the sheet of paper without crossing lines. That's why fig. (iii) is nonplanar graph. Hence alternative (D) is the correct answer.
