Physics - Semiconductors Question with Solution | TestHub

Output of gate-1, $Y_1=\bar{A}$ Output of gate-2, $Y_2=\bar{B}$ Output of gate-3, $\begin{array}{rl}Y=\overline{Y_1+Y_2}& =\overline{\bar{A}+\bar{B}}\\ & =\overline{\bar{A}}\overline{\bar{B}}\\ & =AB\end{array}$ which is the output of AND gate.