Let $\mathrm{U}$ be universal set of all the students of Class $\mathrm{XI}$ of a coeducational school and $\mathrm{A}$ be the set of all girls in Class $\mathrm{XI}$. Find $\mathrm{A}'.$
Let $\mathrm{U}$ be universal set of all the students of Class $\mathrm{XI}$ of a coeducational school and $\mathrm{A}$ be the set of all girls in Class $\mathrm{XI}$. Find $\mathrm{A}'.$
Since $A$ is the set of all girls, $A'$ is clearly the set of all boys in the class.
Now, we want to find the results for $(A \cup B)^{\prime}$ and $A^{\prime} \cap B^{\prime}$ in the followng example.
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