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Questions › DSE › DSE 2015 › Q33
2 marks, −0.666666666666667Mathematics › Real analysis › Topology of the real line: open, closed and compact setsModerateabout 3 min

DSE 2015 Question 33: Real analysis

The set (0,1)(0,1)(0,1) can be expressed as

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The set (0,1) can be expressed as (A) the union of a finite family of closed intervals (B) the intersection of a finite family of closed intervals (C) the union of an infinite family of closed intervals (D) the intersection of an infinite family of closed intervals

Real analysis has come up 38 times in 5 exams since 2005.

What this question tests

This question is on Topology of the real line: open, closed and compact sets, part of Real analysis in Mathematics.

Which sets are open, closed or compact and how unions and intersections behave.

TestStop has 29 past-paper questions on this subtopic.

Practise Real analysisMore on Topology of the real line: open, closed and compact sets

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Question from the DSE 2015 paper. Solutions are TestStop's own. Not affiliated with or endorsed by any examination authority.