Digital Electronics
A self-complementing code for the decimal digits is created using the weight 4 4 3 -2. The value of 8592 in the code is

 1100 0111 1111 0011
 1100 1001 1111 1000
 1100 1011 1111 1001
 1000 0101 1001 0010

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Digital Electronics
2421 code is

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

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