A

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Q. How many full adders are required to construct an m-bit parallel adder?

  • (A) m/2
  • (B) m
  • (C) m-1
  • (D) m+1
Explanation by: Admin
we need adder for every bit. so we should need m bit adders. a full adder adds a carry bit to two inputs and produces an output and a carry. but the most significant bits can use a half adder which differs from the full adder as in that it has no carry input, so we need m-1 full adders and 1 half adder in m bit parallel adder.

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