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De morgan's law for set theory - class-XI

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State True or False:  $(A\cup B)'=A'\cap B'$

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A
True
💡 Explanation:

We have the De Morgan's theorem,

i) $(A\cup B)=A'\cap B'$
ii) $( A\cap B)=A' \cup B'$.
The given identity is the first one.
Hence the this statement is  true.

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