Activity: Do the following 1. Which of the following sets are well-defined? Explain your answer. a.) the set of school principals b.) the set of whole numbers less than 20 c.) the set of even numbers greater than 10 2. Write the set described below in roster form. C = the set of multiples of five less than 5 3. Write the given set in descriptive form. U = {4, 8, 12, 16, 36 4. Write the given set in set builder notation. A = facute, right, obtuse, reflex} 5. List all the possible subsets of C = 4, 8, 12). 6. Determine the cardinality of the given set A = {tr, i, a, n, g, h, e, s. 7. Let A = {0, 1, 2, 3, 4, 5; B = 0, 1, 5, 6, 9; C - 10, 2, 6, 7, 8), find AnBnC. 8. Let A = {1, 2, 3, 4, 5, 6, 7} B-{1, 3, 5, 7, 9) C= 0, 2, 4, 6, 10) Find (AUB) - C. 9. Given A= {positive whole numbers less than 20. B = {odd numbers). Find A-B. 10. Given A= {1, 8, 9), B = 2, 3, 4) and C = 5, 6, 7). What is the universal set?


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