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Q1:

The following circuit is implementation of:
  1. sum of full adder
  2. carry of half adder
  3. difference of full subtractor

A 1 only

B 3 only

C 2 only

D 1 and 2 both

ANS:D - 1 and 2 both

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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