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9’s complement of 23456 is?

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9’s complement of 23456 is?

(a) 87654

(b) 76543

(c) 12345

(d) none of the mentioned

I have been asked this question during an online interview.

The question is from Number Theory topic in portion Number Theory and Cryptography of Discrete Mathematics

1 Answer

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Best answer
Correct option is (b) 76543

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

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