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Q. The Boolean expression for the truth table given below is:
A B Y
0 0 1
0 1 1
1 0 1
1 1 0

BHUBHU 2006

Solution:

The given truth table corresponds to NAND gate, whose Boolean expression
is, $Y=\overline{ A \cdot B }$
Or $Y=\overline{ A }+\overline{ B }$
(De Morgan's theorem)