Question

Which logic gate is represented by the following combination of logic gates ?

• A. NAND
• B. AND
• C. NOR
• D. OR

Answer 1

Answer: (B)

AND

Answer 2

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