Question: 1. Vertex Cover: Given a graph G with n vertices, and a number k (1 k n), does G have a set S of k

1. Vertex Cover: Given a graph G with n vertices, and a number k (1 k n), does G have a set S of k (or fewer) vertices so that every each edge of the graph is incident to at least one vertex of the set? That is, every edge has at least one end at a vertex in the set S

a. Give a yes instance b. Give a no-instance

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