Digital electronics (L-8) :-  "the (r-1)'s Complement, 9's and 1's complement

Digital electronics (L-8) :- "the (r-1)'s Complement, 9's and 1's complement

in number system the complement is use for simplifying subtraction and logical manipulation. the (r-1)'s complement method. 9's complement for decimal. 1's complement for binary system.