# Which of the following graphs are isomorphic to each other?

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Which of the following graphs are isomorphic to each other?

(a) fig 1 and fig 2

(b) fig 2 and fig 3

(c) fig 1 and fig 3

(d) fig 1, fig 2 and fig 3

My question is from Undirected Graph topic in section Graph of Data Structures & Algorithms I

I have been asked this question by my college professor while I was bunking the class.

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Right answer is (d) fig 1, fig 2 and fig 3

The best explanation: All three graphs are Complete graphs with 4 vertices.

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