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If a number system is consist of base r then it has two complements

1)  r

2)  r-1

Decimal number has 9’s complements and 10’s complements. Binary number has 1’s and 2’s complements .  We can find the 1,s complement by subtracting all the given binary digit by 1 . If we subtract “1” from 1,s complement we get 2,s complements


Example: Find the 1’s complement of 11101




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