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Which of the following adders can add three or more numbers at a time ?

  • A.Parallel adder
  • B.Carry-look-ahead adder
  • C.Carry-save-adder
  • D.Full adder

Answer: C

Correct answer: Carry-save-adder

A carry-save adder reduces three numbers to two - a partial sum and a carry vector - without propagating carries, so several numbers can be added at once and the carries resolved only at the final step. The other adders take two operands at a time.

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