I am new to graph theory and I am not sure if I got this correct. I said that there is going to be only one induced subgraph of a graph on n vertices because you have to include all the edges that connect the n vertices.
$2.$ Draw all the subgraphs of $K_{3}$ and find how many are induced subgraph.
For this one I got six subgraphs but I am not sure how many of these are induced subgraph. How do I figure this out? Also if you took the three vertices without any edges connecting them, would you call this a subgraph?
Thank you.