Question 102
Find the minimum possible number of the edges of a graph with $n$ vertices having the following property:
a) If we draw an arbitrary new edge then a new triangle (3-clique) appears.
b) If we draw an arbitrary new edge then a new 4-clique appears.
a) If we draw an arbitrary new edge then a new triangle (3-clique) appears.
b) If we draw an arbitrary new edge then a new 4-clique appears.