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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 

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f(x,y,z) = ( (x.y')' . (y.z)' )'

           =  (x.y') + (y.z)

It can't be further simplified ( you can cross check by karnaugh map ) therefore none of the x,y,z is redundant.

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