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1’s complement can be easily obtained by using _________

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1’s complement can be easily obtained by using _________

(a) Comparator

(b) Inverter

(c) Adder

(d) Subtractor

I got this question in an interview for internship.

My enquiry is from 1’s, 2’s, 9’s & 10’s Complements topic in chapter Number System and Codes of Digital Circuits

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Best answer
Right option is (b) Inverter

The best explanation: With the help of inverter the 1’s complement is easily obtained. Since, during the operation of 1’s complement 1 is converted into 0 and vice-versa and this is well suited for the inverter.

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