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Digital ElectronicsCombinational Circuits

A full subtractor has inputs A, B and Bin. Its difference output is?

  • AA XOR B XOR Bin
  • BA + B + Bin
  • CAB + Bin
  • DA XNOR B XNOR Bin
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Correct Answer: A. A XOR B XOR Bin
Explanation: The difference bit of a full subtractor is the modulo-2 sum A XOR B XOR Bin.
Reference: Standard digital electronics: full subtractor
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