Digital Electronics
2421 code is

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

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Digital Electronics
EBCDIC is abbreviated as

 Extended Bit Coded Decimal Interchange Code
 Extended Binary Color Decimal Interchange Code
 Extended Binary Coded Decimal Interchange Code
 Extended Binary Coded Dectation Interchange Code

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