Question

3. Which of the following is not correct?
1) A CA if and only if A = 0
2) Aºc A 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=Bnc​

Answer 1

Answer:

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