Question

Which of the following is not correct?
1) A CAⓇ if and only if A = 0
2) AⓇ CA if and only if A = X, where X is the
universal set
3) If AUB=AUC, then B=C
4) A=B is equivalent to AUC=BUC and
AnC=BC​

Answer 1

Step-by-step explanation:

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