Digital Electronics
The output of a NAND gate is low

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

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Digital Electronics
2421 code is

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

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