<P> Replacing 00391 with its nines' complement and adding 1 produces the sum: </P> <P> Dropping the leading "1" gives the correct answer: 47641 . </P> <Table> <Tr> <Th> Binary digit </Th> <Th> Ones' complement </Th> </Tr> <Tr> <Td> 0 </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> 0 </Td> </Tr> </Table> <Tr> <Th> Binary digit </Th> <Th> Ones' complement </Th> </Tr>

How to find n's complement of a number