Question

The output of a logic gate is '1' when all its inputs are at logic '0'. The gate is either

Answer 1

NOR gate $\Rightarrow F=\overline{A+B}=\overline{A}.\overline{B}$
When all the inputs are zero, the output is 1.

EX-NOR gate $\Rightarrow F=A⨀B=\overline{A}.\overline{B}+AB$
​​​​​​​When all the inputs are zero, the output is 1.