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it is subtraction not substraction
A self complementing code is one thats 9's complement in decimal is the 1's complement in binary.Ex: The 9's complement of 7 is 2 in decimal. In 2421 code, and .
To find the 9s complement, subtract each digit from 9: 27 → 72
67. 9-3 9-2 =67
gray code is reflective because 9's complement of any number and 1,s complement of code is same i.e 0 reflect 9 1 reflect 8