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A non-planar graph can have ____________

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A non-planar graph can have ____________

(a) complete graph

(b) subgraph

(c) line graph

(d) bar graph

This question was addressed to me during an interview.

I want to ask this question from Planarity, Degree and Coloring of Graph in chapter Graphs of Discrete Mathematics

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Best answer
The correct choice is (b) subgraph

The best explanation: A non-planar graph can have removed edges and vertices so that it contains subgraphs. However, non-planar graphs cannot be drawn in a plane and so no edge of the graph can cross it.

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