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Which of the following is not correct? 1...

Which of the following is not correct? 1 )`AsubeA^c` if and only if `A=phi` 2) `A^csubeA` if and only if A = X , where X is a universal set 3)If A UB = A UC , then B = C 4) A = B is equivalent to AUC = BUC and `AnnC=BnnC`

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