Which of the following is not correct? P (1) \( \overline{\bar{A} \...
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Which of the following is not correct?
P
(1) \( \overline{\bar{A} \cdot \bar{B}}=A+B \)
W
(2) \( \overline{\bar{A} \cdot \bar{B}}=A \cdot B \)
(3) \( \overline{\overline{(A \cdot B)} \cdot \overline{(A \cdot B)}}=A B+A B \)
(4) \( \overline{1}+\overline{1}=1 \)
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