Question: 4. a. Is 2{2} ? b. How many elements are in the set {2,2,2,2} ? c. How many elements are in the set {0,{0}} ?

4. a. Is 2{2} ? b. How many elements are in the set {2,2,2,2} ? c. How many elements are in the set {0,{0}} ? d. Is {0}{{0},{1}} ? e. Is 0{{0},{1}} ? 7. Use the set-roster notation to indicate the elements in each of the following sets. a. S={nZn=(1)k, for some integer k}. b. T={mZm=1+(1)i, for some integer i}. c. U={rZ2r2} d. V={sZs>2 or s

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