(x + y)' = x' y' is defined under
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Demorgan's theorem
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Karnaugh theorem
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Kelvin theorem
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Associative property
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.