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If A is an open set and B is a closed set, then B - A is

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If A is an open set and B is a closed set, then B - A is
1. Open set
2. Closed set
3. Both open and closed set
4. None of these
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Correct Answer - Option 2 : Closed set

Concept: 

The open set has no boundary whether the closed set has a boundary.

If A is an open set and B is a closed set then,

B - A = closed set - open set 

⇒ closed set

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