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For a logic gate, the output is LOW whenever at least one of its inputs is HIGH. Which gate satisfies this condition?

1. NOR
2. OR
3. AND
4. NAND

Correct answer: NOR

Solution

A NOR gate produces a LOW output whenever one or more inputs are HIGH, because it is the complement of OR. OR alone gives HIGH when any input is HIGH (not LOW). AND gives LOW only when at least one input is LOW. NAND gives LOW only when ALL inputs are HIGH.

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