Digital Electronics
The output of a NOR gate is high

 only when at least one input is high
 only when all the inputs are low
 only when at least one input is low
 only when all the inputs are high

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Digital Electronics
2421 code is

 weighted self-complementing code
 non-weighted self-complementing code
 weighted non-self-complementing code
 non-weighted and non-self-complementing code

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