a. In a group of 15 people, is it possible for each person to have exactly 3 friends
Chapter 10, Problem 27(choose chapter or problem)
a. In a group of 15 people, is it possible for each person to have exactly 3 friends? Explain. (Assume that friendship is a symmetric relationship: If x is a friend of y, then y is a friend of x.)
b. In a group of 4 people, is it possible for each person to have exactly 3 friends? Why?
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