4.1.6. (-) For a graph G with blocks B₁,..., Bk, prove that n(G) = (Σ₁n(B;)) − k +1.

Q: 2.)Is K6 planar? Explain

A:

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Strongly Connected Components

 A directed graph in which a path exists between all its pairs of vertices is called a strongly connected graph. A portion of the strongly connected directed graph that contains a path to reach from each vertex to other vertices is called a strongly connected component (SCC).