A graph has vertices of degrees 0,2,2,3, and 9. How many edges does the graph have?

I need help with those questions; thank you. 1, A simple digraph with 4 vertices with in-degrees 0, 1, 2, 2 and out-degrees 0, 1, 1, 3. Is it possible or impossible? Show an example or explain why it’s impossible 2, A simple digraph with 5 vertices with in-degrees 0, 1, 2, 4, 5 and out-degrees 0, 3, 3, 3, 3. Is it possible or impossible? Show an example or explain why it’s impossible.

Question 4. Let K, be the complete graph on n vertices. How many edges does it have? Justify your answer.

Construct a graph with vertices J, K, L, M, N whose degrees What is the edge set? "