Digital Electronics
An exclusive NOR gate is logically equivalent to

 NOT gate followed by a NOR gate
 complement of a NOR gate
 X-OR gate followed by an inverter
 inverter followed by an X-OR gate

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Digital Electronics
2421 code is

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

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