If A is any set, then

1.	If A is any set, then
A.	\[A\cup {A}'=\varphi \]
B.	\[A\cup {A}'=U\]
C.	\[A\cap {A}'=U\]
D.	None of these
Answer» C. \[A\cap {A}'=U\]

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If A is any set, then

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