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[248](Solved on 2022-10-25) Given a set \(X\) and \(I,C_ i\) as in [1W1] and [1Y2], show that
\begin{equation} X\setminus \left( ⋂_{i∈ I}C_ i\right) = ⋃_{i∈ I}(X\setminus C_ i)\quad . \label{eq:setminus_ inter_ union} \end{equation}
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What happens when \(I\) is the empty set?
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