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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Digital Electronics
In case of OR gate, no matter what the number of inputs, a

1 at any input causes the output to be at logic 1
0 any input causes the output to be at logic 0
1 at any input causes the output to be at logic 0
0 at any input causes the output to be at logic 1.

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