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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 (i) only

B (iii) only

C (ii) only

D (i) and (ii)

ANS:D - (i) and (ii)

Now it is evident from the truth tables that sum and differennce are same.



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