Exercise · ZW-CONNECTED-GRAPH-003 · ★☆☆ Basic
A graph with vertices \(1,\dots,6\) has edges \(12\), \(34\) and \(56\). How many connected components does it have?
Choose one option.
Show answer
- C. 3
Explanation
Each edge joins a pair of vertices and the pairs \(\{1,2\}\), \(\{3,4\}\), \(\{5,6\}\) are not linked to each other: that makes 3 components.
Review the concept: Connected graph
A graph \(G=(V,E)\) is connected if any two vertices \(u,v\in V\) are joined by a path.
\[\forall\,u,v\in V\ \ \exists\ \text{path from } u \text{ to } v\]
More practice problems: connected graph
- ZW-CONNECTED-GRAPH-001 A graph has vertices 1,2,3,4 and edges 12, 23, 34. Is it connected?
- ZW-CONNECTED-GRAPH-002 A graph with vertices 1,dots,5 has edges 12, 23 and 45. How many connected components does it have?
- ZW-CONNECTED-GRAPH-004 What is the smallest number of edges a connected graph with 8 vertices can have?
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- ZW-CONNECTED-GRAPH-007 A graph with 6 vertices has 11 edges. What can be said?
- ZW-CONNECTED-GRAPH-008 In the cycle 1,2,3,4,5,6,1 (edges 12,23,34,45,56,61) the edges 12 and 45 are removed. How many conn…
- ZW-CONNECTED-GRAPH-009 Let G be a connected graph and e an edge that lies on a cycle of G. After removing e, the resulting…