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On addition of -33 and -40 using 2’s complement, we get ____________

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On addition of -33 and -40 using 2’s complement, we get ____________

(a) 1001110

(b) -110101

(c) 0110001

(d) -1001001

I had been asked this question during an interview for a job.

This interesting question 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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Correct answer is (d) -1001001

Best explanation: The BCD form is written of the two given numbers, in their signed form. After which, normal binary addition is performed.

Augend is -40  and Subtrahend is -33.

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