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Digital ElectronicsCombinational Circuits

For a full adder, the carry-out expression can be written as?

  • AA XOR B XOR Cin
  • BAB + ACin + BCin
  • CA + B + Cin
  • DABCin only
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Correct Answer: B. AB + ACin + BCin
Explanation: The full-adder carry is 1 whenever at least two of the three inputs are 1, giving Cout = AB + ACin + BCin.
Reference: Standard digital electronics: full adder
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