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Q. $A^{\prime} \cup\left\{(A \cup B) \cap B^{\prime}\right\}=$

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Solution:

$A^{\prime} \cup\left\{(A \cup B) \cap B^{\prime}\right\}$
$A^{\prime} \cup\left\{\left(A \cap B^{\prime}\right) \cup\left(B \cap B^{\prime}\right)\right\}$
$A^{\prime} \cup\left(A \cap B^{\prime}\right)=\left(A^{\prime} \cup A\right) \cap\left(A^{\prime} \cup B^{\prime}\right)=A^{\prime} \cup B^{\prime}=(A \cap B)^{\prime}$