Discussion
The number of full and half-adders required to add 16-bit numbers is
Answer: B
Correct answer: 1 half-adder, 15 full-adders
The least significant bit has no carry coming into it, so a half adder suffices there; each of the remaining fifteen bits must add three quantities - two bits and a carry - which needs a full adder. In general an n-bit ripple adder takes one half adder and \( n-1 \) full adders.
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