Digital Electronics
A half adder has

 2 inputs and 1 outputs
 1 input and 2 outputs
 2 inputs and 2 output
 1 input and 1 output

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Digital Electronics
2421 code is

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

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