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How many inputs does a full adder have ?

  • A.Two
  • B.Three
  • C.Four
  • D.Five

Answer: D

Correct answer: Three

A full adder takes three inputs - the two bits being added and a carry-in from the previous stage - and produces a sum and a carry-out. That carry-in is exactly what a half adder lacks, which is why half adders cannot be chained.

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