Discussion
From the truth table for a three-input NOR gate, what is the only condition of inputs A, B, and C that will make the output X high?
Answer: D
Correct answer: A = 0, B = 0, C = 0
NOR is the complement of OR, and OR is 0 only when every input is 0. So the NOR output is HIGH in that single case out of eight.
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