How many edges are there in a complete graph of order 9?(a) 35(b) 36(c) 45(d) 19I had been asked this question during an interview for a job.My doubt is from Trees in chapter Trees of Discrete Mathematics

How many edges are there in a complete graph of order 9?(a) 35(b) 36(c

1.	How many edges are there in a complete graph of order 9?(a) 35(b) 36(c) 45(d) 19I had been asked this question during an interview for a job.My doubt is from Trees in chapter Trees of Discrete Mathematics
Answer» Right answer is (b) 36 Explanation: In a COMPLETE graph of order n, there are n*(n-1) number of EDGES and degree of each vertex is (n-1). HENCE, for a graph of order 9 there should be 36 edges in total.

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