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The rule that the complement of a union equals the intersection of the complements is one of:
ADe Moivre's laws
BDescartes' laws
CDedekind's laws
DDe Morgan's laws
Answer & Solution
Correct answer: D. De Morgan's laws
1. The other half swaps union and intersection.
2. Both are named after one mathematician.
3. These are De Morgan's laws.
_Source: NCERT Class 11 Mathematics, Chapter 1, Sets._
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