How many vertices and edges are there in $K_{i,j}$ and $K_{i,j,k}$?
How to find the number of vertices and edges in these graphs?
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graph-theory
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2Welcome to math.SE, mehtap karabacak: since you are a quite new user, I wanted to let you know a few things about the site. In order to get the best possible answers, it is helpful if you say in what context you encountered the problem, and what your thoughts on it are so far; this will prevent people from telling you things you already know, and help them write their answers at an appropriate level. – 2012-06-05
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0[Wikipedia is a useful resource](http://en.wikipedia.org/wiki/Complete_bipartite_graph) – 2012-06-05