For the logic network shown, A and B each pass through a NOT gate, followed by a NOR gate. Which truth table is correct?
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Question

For the logic network shown, A and B each pass through a NOT gate, followed by a NOR gate. Which truth table is correct?

G1 Physics · Accepted Answer

First NOT stages produce A̅ and B̅. The final NOR gate yields Y = NOT(A̅ + B̅) = A·B (De Morgan’s law). Hence the output truth sequence for inputs 00,01,10,11 is 0,0,0,1. Final answer: Option D (AND gate).