Multiple choice

(x + y)' = x' y' is defined under

  1. Demorgan's theorem

  2. Karnaugh theorem

  3. Kelvin theorem

  4. Associative property

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A Correct answer
Explanation

(x + y)' = x' y' is the first of De Morgan's two laws, which states that the complement of a sum (OR operation) equals the product (AND operation) of the individual complements. This is a fundamental theorem used to simplify Boolean expressions.