1.

For any set A, (A’) is equal to A. A’ B. A C. φ D. none of these

Answer»

Here, 

Question is (A')' = ?

Now, 

A'=U∖A 

⇒(A' )' = (U∖A)' = U'∖A' 

⇒(A' )' = U'∖(U∖A) 

⇒(A' )' = ϕ∖U+A 

⇒(A' )' = A



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