Question: Consider the lexicographically ordered adjacency matrix 0 1 1 1 0 0 1 0 1 0 0 0 1 1 0 1 1 1 A

Consider the lexicographically ordered adjacency matrix

0 1 1 1 0 0

1 0 1 0 0 0

1 1 0 1 1 1

A = 1 0 1 0 0 0

0 0 1 0 0 1

0 0 1 0 1 0

for a graph G with vertex set { a,b,c,d,e, f } .

a) Sketch this graph and state the degrees of each of the nodes.

b) State, with justification, whether this is a simple graph, or not.

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