Discussion
If a signal passing through a gate is inhibited by sending a LOW into one of the inputs, and the output is HIGH, the gate is a(n):
Answer: B
Correct answer: NAND
Holding one input of an AND or NAND gate LOW forces the AND function to 0, which blocks the signal on the other input. If the output is then HIGH, the gate must be inverting the blocked 0 - so it is a NAND.
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