Question:
If A, B, C are three sets such that
Solution:
Let $a \in C-B$
$\Rightarrow a \in C$ and $a \notin B$
$\Rightarrow a \in C$ and $a \notin A \quad[\because A \subset B]$
$\Rightarrow a \in C-A$
Hence, $C-B \subset C-A$
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