How many full and half-adders are required to add 16-bit numbers?
A. 8 half-adders, 8 full-adders
B. 1 half-adders, 15 full-adders
C. 16 half-adders, no full-adders
D. 4 half-adders, 12 full-adders
E. None of the above
Answer: Option B
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For LSB addition we do not need a full adder.
For addition of subsequent bits we need full adders since carry from previous addition has to be fed into the addition operation. So,
Number of H.A = 1
Number of F.A = 15