# Set Theory -- Union and Complement.

Given U = {15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25}, A = {16, 18, 20, 22}, and B = {17, 19, 20, 23, 24}.

Find A′ B′. Do not skip to the answer. Show your work, finding A', then B' then find their union.

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