Digital Electronics
An X-OR gate gives a high output

 for odd decimal value.
 if the decimal value of digital word is even
 if it has even number of 0s
 if there are odd number of 1s

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Digital Electronics
2421 code is

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

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