$\begin{array}{c|c|c} A & B & Y \\ \hline 0 & 0 & 1 \\ 0 & 1 & 1 \\ 1 & 0 & 0 \\ 1 & 1 & 1 \end{array}$ To obtain the given truth table, following logic gate should be placed at G:
OR Gate
AND Gate
NOR Gate
NAND Gate
Solution
For NOR gate : $\overline{\mathrm{A} \overline{\mathrm{B}}}=\overrightarrow{\mathrm{A}}+\mathrm{B}$