Which of the following is not correct?

1.	Which of the following is not correct?
A.	A ÍA' if and only if A = ?
B.	B = C if and only if A U B = A U C and A ? B = A? C
C.	A' Í A if and only if A = X, where X is the universal set
D.	All of these
Answer» E.

Discussion

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