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What is the number of unlabeled simple directed graph that can be made with 1 or 2 vertices?

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in Data Structures & Algorithms I by (88.7k points)
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) 9

My enquiry is from Directed Graph in section Graph of Data Structures & Algorithms I

The question was posed to me in a job interview.

1 Answer

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Best 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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