- 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.