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The full adder adds the Kth bits of two numbers to the

  • A.difference of the previous bits
  • B.sum of all previous bits
  • C.carry from ( K - 1 )TH bit
  • D.sum of previous bit

Answer: C

Correct answer: carry from ( K - 1 )TH bit

A full adder at bit position k adds the two operand bits of that position together with the carry produced by position \(k-1\). It is that third input that distinguishes it from a half adder.

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