Multiple choice

(xy)' = x' + y' is commonly referred to as

  1. Demorgan's theorem

  2. Karnaugh theorem

  3. Kelvin theorem

  4. Commutative property

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A Correct answer
Explanation

De Morgan's theorem states that the complement of a product (AND) equals the sum (OR) of the complements. The dual form is (x + y)' = x' · y'.