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Nine’s complement of a number is formed by _________

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Nine’s complement of a number is formed by _________

(a) replacing each digit by 9 minus that digit

(b) replacing each digit by 1plus that digit

(c) replacing each digit by 8 minus that digit

(d) None of the mentioned

I had been asked this question in an internship interview.

My doubt is from Number Theory topic in chapter Number Theory and Cryptography of Discrete Mathematics

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The correct option is (a) replacing each digit by 9 minus that digit

Explanation: Nine’s complement of a number is formed by replacing each digit by 9 minus that digit.

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