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

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Digital Electronics
In K-map simplification, a group of four adjacent 1s leads to a term with

 three literals less than the total number of variables
 two literals less than the total number of variables
 four literals less than the total number of variables
 one literal less than the total number of variables

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