Which of the following is not a valid expression of Boolean Algebra? – McqOptions

MCQOPTIONS

1.	Which of the following is not a valid expression of Boolean Algebra?
A.	x + x.y = x
B.	x'.y + x.y = y
C.	x'.y' + x.y = x
D.	(x + y + z)' = x'.y'.z'
Answer» D. (x + y + z)' = x'.y'.z'

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