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In a half adder, the SUM output is produced by which gate ?

  • A.AND gate
  • B.OR gate
  • C.XOR gate
  • D.NAND gate

Answer: B

Correct answer: XOR gate

A half adder adds two bits and produces SUM = A ⊕ B from an XOR gate, while CARRY = A · B comes from an AND gate. XOR is the right choice because the sum bit is 1 exactly when the two inputs differ.

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