Computer Science for IGCSE & O level - Boolean Logic (Section 9 - No. 43)
Which statement describes a logic circuit with the expression NOT (A OR B)?
It produces 1 if both A and B are 0, and 0 otherwise.
It produces 1 if either A or B is 1, and 0 otherwise.
It produces 0 if both A and B are 0, and 1 otherwise.
It produces 0 if either A or B is 0, and 1 otherwise.
Giải thích
The expression means you take the output of an OR gate and invert it, which is the same as a NOR gate. The output is 1 only when both inputs are 0.