Editor
Let $U=\{1,2,3,4,5\}$ and $A=\{2,3,5\}$ then $A'=$
Difficulty: Easy
A: 

$\{2,3,5\}$

B: 

$\{1,2,3,4,5\}$

C: 

$\{1,4\}$

D: 

$\{4,5\}$

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