That is exactly the 9‘s complement. The digits add up to 9. | Hacker News

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		Lukas_Skywalker on June 28, 2023 \| parent \| context \| favorite \| on: Finally getting two's complement That is exactly the 9‘s complement. The digits add up to 9.

venusenvy47 on July 10, 2023 [–]

I thought there was more to the calculation of N's complement. Something about adding one to the result. It doesn't seem like something you can easily perform using inspection.

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