Question: How many undirected graphs which are not necessarily connected can be formed out of a provided set V= {V 1, V 2,V n} of n

How many undirected graphs which are not necessarily connected can be formed out of a provided set V= {V 1, V 2,…V n} of n vertices?

A. n(n-l)/2

B. 2^n

C. n!

D. 2^(n(n-1)/2)

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