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1 solution
Given that,
U = { 1 , 2 , 3 , 4 , 5 , 6 }
A = { 2 , 4 }
B = { 3 , 4 , 5 }
( A ∪ B ) ′
= U − ( A ∪ B )
= { 1 , 2 , 3 , 4 , 5 , 6 } − { 2 , 4 } ∪ { 3 , 4 , 5 }
= { 1 , 2 , 3 , 4 , 5 , 6 } − { 2 , 3 , 4 , 5 }
= { 1 , 6 }