Consider the following circuit.
Which one of the following is TRUE?
(A) f is independent of X
(B) f is independent of Y
(C) f is independent of Z
(D) None of X, Y, Z is redundant
Answer: (D)
Explanation: [(XY’)’ NAND (YZ)’]= [(XY’)’ .(YZ)’]’
=XY’+YZ
SO NONE OF X,Y,Z IS REDUNDANT
Ans (D)