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What is the number of unlabeled simple directed graph that can be made with 1 or 2 vertices?(a) 2(b) 4(c) 5(d) 9My enquiry is from Directed Graph in section Graph of Data Structures & Algorithms IThe question was posed to me in a job interview.

Answer» CORRECT choice is (b) 4

Explanation: The NUMBER of UNLABELED simple directed GRAPH that can be made with 1 or 2 VERTICES is 4


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