Which of the folowing is not correct a. (x+y)’=x’.y’ b. (x’+y’)’=x.y c. (x’.y’)’=x+y d. (x’+y’)’=x’.y’

Which of the folowing is not correct   a. (x+y)’=x’.y’   b. (x’+y’)’=x.y   c. (x’.y’)’=x+y   d. (x’+y’)’=x’.y’

Ques:- Which of the folowing is not correct
a. (x+y)'=x'.y' b. (x'+y')'=x.y
c. (x'.y')'=x+y d. (x'+y')'=x'.y'

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