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Let A and B is the input of a subtractor then the borrow will be ___________

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Let A and B is the input of a subtractor then the borrow will be ___________

(a) A AND B’

(b) A’ AND B

(c) A OR B

(d) A AND B

The question was posed to me during an internship interview.

Question is taken from Half & Full Subtractor topic in section Arithmetic Circuits of Digital Circuits

1 Answer

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Best answer
The correct answer is (b) A’ AND B

The best explanation: The borrow of a subtractor is received through AND gate whose one input is inverted. On that basis the borrow will be (A’ AND B).

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