Digital Electronics
The output of a logic gate is 1 when all its inputs are at logic 1. The gate is either

 an AND or an OR
 a NAND or a NOR
 an AND or a NOR
 an OR or an X-OR

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Digital Electronics
2421 code is

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

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