How many numbers of half adders are required for m-bit numbers?
- A. 2 × m - 1
- B. 2^m - 1
- C. 2 × m + 1
- D. 2 × m
Answer: A. 2 × m - 1
Explanation: An m-bit adder requires 1 half adder and (m − 1) full adders. Since each full adder consists of 2 half adders, total half adders = 1 + 2(m − 1) = 2m − 1.