Digital Electronics
An AND gate will function as OR if

All the inputs to the gates are “1”
All the inputs and outputs are complemente'
Either of the inputs is “1”
All the inputs are ‘0’

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Digital Electronics
2421 code is

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

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