Question

if the simple graph G has 5 vertices and 7 edges, how many edges does G have ?

Comments

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@Ashwin ,  i believe this was his question
If the simple graph G has 5 vertices and 7 edges, how many edges does G` have ?

Answer 1

If the simple graph G has 5 vertices and 7 edges, how many edges does G` have ? - If this was your question

with 5 vertices a complete graph can have 5c2 edges => 10 edges 

We know that edges(G) + edges(G`)=10 so edges(G`)=10-7=3

Had it been
If the simple graph G` has 5 vertices and 7 edges, how many edges does G have ?
Then G would've had 3 edges