Let U = {1, 2, 3, …, 18, 19, 20}, A = {2, 4, 6, 8, 10} and B = {1, 3, 5, 7, 9}.
a. How many elements are represented by the shaded region in Figure 2.38a?
b. How many elements are represented by the shaded region in Figure 2.38b?
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