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  1. The following circuit is implementation of:

    1. sum of full adder
    2. carry of half adder
    3. difference of full subtractor

    2. A.
    1 only
    B.
    3 only
    C.
    2 only
    D.
    1 and 2 both

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    Answer : Option D

    Explanation :

    Let the two bits be A and B. Then the truth table be:

    Now it is evident from the truth tables that Sum and Difference are same.

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