Q. 53 The circuit in the figure has 4 boxes each described by inputs P,Q,R and outputs Y,Z with
The circuit acts as 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: (B)
Explanation:
