graph theory

amandeep singh (anonymous)
  • The number  of  colors  required  to properly  color  the  vertices  of  every planer graph is

(A)  2               (B) 3                (C)  4                           (D)  5

  • G1 and G2 are two graphs as shown :

(A)  Both  G1  and  G2  are  planar graphs.  (B)  Both  G1  and  G2  are  not  planar graphs.

(C)  G1 is planar and G2 is not planar graph.  (D)  G1 is not planar and G2 is planar graph.

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