1.

The circuit shown in the figure has 4 boxes each described by inputs P, Q, R and outputs Y, Z withY = P ‚äï Q ‚äï R, Z = RQ + P R + Q PThe circuit is a

A. 4 bit adder giving P + Q
B. 4 bit subtractor giving P - Q
C. 4 bit subtractor giving Q - P
D. 4 bit adder giving P + Q + R
Answer» C. 4 bit subtractor giving Q - P


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