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GATE | GATE-CS-2004 | Question 81
Let G1 = (V, E1) and G2 = (V, E2) be connected graphs on the same vertex set V with more than two vertices. If G1 ∩ G2 = (V, E1 ∩ E2) is not a connected graph, then the graph G1 U G2 = (V, E1 U E2)
(A)
cannot have a cut vertex
(B)
must have a cycle
(C)
must have a cut-edge (bridge)
(D)
has chromatic number strictly greater than those of G1 and G2
Answer
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