SOLUTION: Given U = {21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31}, A = {21, 23, 25, 27, 29}, and B = {22, 25, 28, 29}. Find A′ U B′.

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A' is the set of all elements that is not contained in A but is contained in U.
So, A'={22, 24, 26, 28, 30, 31}
Similarly, B'={21, 23, 24, 26, 27, 28, 30, 31}
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Finally, A′ U B′ is the set of all elements contained in either A' or B'.
So, A′ U B′={21, 22, 23, 24, 26, 27, 28, 30, 31}