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Digital ElectronicsArithmetic Circuits

In unsigned binary subtraction A−B, a borrow is required at a bit position when the effective subtrahend at that position is?

  • AGreater than the available minuend bit after considering borrow-in
  • BAlways zero
  • CEqual to the minuend in every case
  • DIndependent of borrow-in
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Correct Answer: A. Greater than the available minuend bit after considering borrow-in
Explanation: A borrow is needed whenever the bit being subtracted, including any incoming borrow effect, exceeds the available minuend value at that position.
Reference: Standard digital electronics: binary subtraction
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