Question 198507
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' = {22, 24, 26, 28, 30, 31} 
B' = {21, 23, 24, 26, 27, 30, 31}
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So A' U B' = {21, 22, 23, 24, 26, 27, 28, 30, 31} 
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Cheers,
Stan H.