Ace Test Series: Discrete Mathematics - Graph Theory

Question

My answer 31 (graph can be linear)

Answer given is 9.

please explain why 31 is wrong :(

Comments

I think they wanted to ask minimum vertices

Because

K9 has 36 edges

K8 has 28 edges

Hence minimum 9 vertices required to make 30 edges.

And maximum 31 can be possible.

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Ok

thank you sir :)

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correct sir