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Please note that A,B ⊂ U, and A U B = {1,2,3,4,5,6} which is set U.
Whenever we have A' it means all the elements except the elements of set A.

1. A' = {2,4,6}
2. A' U B' = {2,4,6} U {1,3} = {1,2,3,4,6}
3. A' U B = {2,4,6} U {2,4,5,6}= {2,4,5,6}