non planar

Question

a bipartite or complete bipartite graph.....both are non planar ?

Comments

 @joshi_nitish

but for complete bipartite graph Kmn we could be sure for non_planer if m,n>=3 ???? 

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@hs_yadav

in qsn, it has not given constraints on m,n therfore i gave general answer

and yes, if m,n>=3 then K_m,n will always be non-planar since it will contain subgraph as K_3,3 which is non-planar

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if e<= 3n -6 is not satisfied we can tell a graph is non planar but that does assure that the graph is planar

what way can be used to confirm planarity of graph