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electronics and communication engineering digital electronics
1. The circuit show in the figure has 4 boxes each described by inputs P, Q, R and outputs y, z with Y = P ⊕ Q ⊕ R, Z = RQ + P R + QP The circuit act as a
(A): 4 bit adder giving P + Q
(B): 4 bit adder P + Q + R
(C): 4 bit subtractor P - Q
(D): 4 bit subtractor Q - P
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