Find 9''s compliment of bcd number using 4-bit binary adder, Computer Engineering

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Design a circuit for determining the 9's compliment of a BCD number by using 4-bit binary adder and some external logic gates?

Compliment of a BCD number

9's compliment is nothing but subtracting the provided number from 9. Therefore by using a 4 bit binary adder we can merely subtract the provided binary number by 1001(that is 9). Now we can use the 2's compliment process addition.

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