The number of triangles in a complete graph with n nodes is
n*(n-1)*(n-2) / 6.
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15
No, the complete graph of 5 vertices is non planar. because we cant make any such complete graph which draw without cross over the edges . if there exist any crossing with respect to edges then the graph is non planar.Note:- a graph which contain minimum one edge from one vertex to another is called as complete graph...
there are 27 triangles in a triangle
There are 15 triangles in a 17-agon
15 triangles