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The result obtained on subtraction using 2’s complement of 1111-0010 will be _________

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The result obtained on subtraction using 2’s complement of 1111-0010 will be  _________

(a) 11101

(b) 11011

(c) 1101

(d) 1011

The question was asked by my college professor while I was bunking the class.

Origin of the question is Complements topic in chapter Computer Arithmetic of Computer Fundamentals

1 Answer

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Right choice is (c) 1101

Explanation: Firstly, the 2’s complement of the 2nd number is obtained.

Then, if carry is generated, it is discarded and the number is positive.

Otherwise, 2’s complement of the result is obtained and the answer is negative.

Here, 1111+1110=1, 1101. Since carry is generated, it is discarded and the answer is positive.

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