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Q. Which logic gate is represented by the following combination of logic gates ?Physics Question Image

AIPMTAIPMT 2015

Solution:

$y_{1} = \bar{A} , \, y_{2} = \bar{B} $
$y = \overline{y_{1} + y_{2}} = \overline{\bar{A} + \bar{B}} $ (using De-morgan's theorem)
$y =A \cdot B$
Hence this logic gate represents AND gate