Question: Problem 4: (30 points) Chapter 2, Exercise 21: Show that the set difference metric given by d(A, B) size(A-B) +size(B - A) satisfies the metric

Problem 4: (30 points) Chapter 2, Exercise 21: Show that the set difference metric given by d(A, B) size(A-B) +size(B - A) satisfies the metric axioms given on page 70. A and B are sets and A - B is the set difference

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