Question
Write any two universal sets $U$ whose subsets are $A =\{a, b, d\}, B =\{x \mid x$ is a letter of word Udaipur $\}$ and $C =\{a, i, u\}$.

Answer

$\begin{array}{l} U =\{a, b, d, i, u, p, r\} \text { and } \\ U =\{x \mid x \text { is a letter of English alphabet }\}\end{array}$

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