Discussion
Which one of the following will give the sum of full adders as output ?
Answer: D
Correct answer: Three bit parity checker
The sum output of a full adder is \( A \oplus B \oplus C_{in} \) - it is 1 whenever an odd number of the three inputs is 1. That is precisely what a three-bit parity checker computes. The carry output, by contrast, is the majority function of the same three bits.
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