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Q5. Show that if A \subsetB, then C – B \subset C – A.

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best_answer

Given ,      A \subset B

To prove :  C – B  \subset C – A

Let, x \in C - B means    x\in C  but  x\notinB

A \subset B  so x\in C but   x\notinA      i.e.   x \in C - A

Hence,    C – B  \subset C – A

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seema garhwal

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