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Which of the following is not correct ?

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$\bar{\bar{A} . \bar{B}} = A + B$

$\bar{\bar{A} . \bar{B}} = A . B$

$\bar{(\bar{A . B}) . (\bar{A . B})} = A . B + A . B$

$\bar{1} + \bar{1} = 1$

answer is D.

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Detailed Solution

1) $\bar{\bar{A} . \bar{B}} = \bar{\bar{A}} + \bar{\bar{B}} = A + B$

2) $\bar{\bar{A} + \bar{B}} = \bar{\bar{A}} . \bar{\bar{B}} = A . B$

3) $\bar{\bar{(A+ B)} . \bar{(A. B)}} = A . B + A . B = A . B + A . B$

4) 0 + 0 = 0

Clearly, 4th option is incorrect.

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