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  4. If A ⊆ B, then B' - A' is equal to

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Q. If $A \subseteq B$, then $B' - A'$ is equal to

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Solution:

$x \in B'$
$\Rightarrow x \notin B$
$\Rightarrow x \notin A$
$\Rightarrow x \in A'$
$\Rightarrow B' \subseteq A'$
$\Rightarrow B' - A' = \phi$