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If $\mathrm{A}$ and $\mathrm{B}$ are disjoint sets, then $A \cap\left(A^{\prime} \cup B\right)$ is equal to which one of the following?
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The correct answer is:
$\phi$
$A \cap\left(A^{\prime} \cup B\right)=A \cap A^{\prime}=\phi$
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