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)

$y_1=\bar{A},y_2=\bar{B}$
$y=\overline{y_1+y_2}=\overline{\bar{A}+\bar{B}}$ (using De-morgan's theorem)
$y=A\cdot B$
Hence this logic gate represents AND gate