The shown logic network has a NOR gate, a second NOR with joined inputs, followed by NOT. What single gate is equivalent?
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Question

The shown logic network has a NOR gate, a second NOR with joined inputs, followed by NOT. What single gate is equivalent?

G1 Physics · Accepted Answer

First stage X = NOT(A + B). A NOR with the same X on both inputs gives NOT(X + X) = NOT(X). The final inverter gives Y = NOT[NOT(X)] = X = NOT(A + B). Final answer: NOR gate, Option C.