Multiple choice

The circuit shown in figure has 4 boxes each described by inputs P, Q, R and outputs Y, Z with Y = P $\oplus$Q $\oplus$R Z = RQ + $\bar P R + Q\bar P$

The circuit acts as a

  1. 4 bit adder giving P + Q

  2. 4 bit subtractor-giving P - Q

  3. 4 bit subtractor-giving Q - P

  4. 4 bit adder giving P + Q + R
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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