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Kenneth Rosen Edition 7 Exercise 6.2 Question 37 (Page No. 406)

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A computer network consists of six computers. Each computer is directly connected to zero or more of the other computers. Show that there are at least two computers in the network that are directly connected to the same number of other computers. [Hint: It is impossible to have a computer linked to none of the others and a computer linked to all the others.]
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