BCD codes 2421 codes Decimal digit 2421 Each digit is weighted 0000 0123 0001 Self-complementing 0010 Use Msb to express 0100 1011 higher/lower part 1100 It has 10 valid codes and 110 6 invalid codesBCD codes Each digit is weighted; Self-complementing; Use MSB to express higher/lower part; It has 10 valid codes and 6 invalid codes. 2421 codes