How to find 9s complement of a given decimal number?

Asked Jun 13 '17 at 02:13

Active Jun 13 '17 at 02:13

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Given decimal number=12 One way to find 9s complement is to simply find 10s complement and subtract 1. By this method I get answer=87.

However can i solve this problem by first finding the equivalent of 12 in base 9 number system which would be 13. Now if I find 9s complement of this number using the formula r^n -N answer would be 81-12. Please suggest what's wrong ?

asked Jun 13 '17 at 02:13

Kishan Kumar

This sounds like a homework problem. Can you show us your work? – Gabriel Fair Jun 13 '17 at 02:15
No this is not a homework problem. – Kishan Kumar Jun 13 '17 at 02:30
see https://en.wikipedia.org/wiki/Method_of_complements I think you are confusing 2 formulas. The thing you are looking at should add to 8, not 9, I think (still subtracting 1). Your goal would be to do 10^2-12-1 to get the 9s complement – Jeremy Kahan Jun 13 '17 at 02:51

How to find 9s complement of a given decimal number?

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