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Digital ElectronicsCombinational Circuits

For a half adder with inputs A = 1 and B = 1, the Sum and Carry outputs respectively are?

  • A0 and 0
  • B0 and 1
  • C1 and 0
  • D1 and 1
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Correct Answer: B. 0 and 1
Explanation: A half adder has Sum = A XOR B and Carry = AB. For A = B = 1, Sum = 0 and Carry = 1.
Reference: Standard digital electronics: half adder
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