limit points open interval closed and compact sets real analysis Gate IIT Jam 2012 mathematics

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Real Analysis: Interior points, limit points, open sets, closed sets, bounded sets, connected sets, compact sets, completeness of R. Power series (of real variable), Taylor's series, radius and interval of convergence, term-wise differentiation and integration of power series.
Sequences and Series of Real Numbers: Sequence of real numbers, convergence of sequences, bounded and monotone sequences, convergence criteria for sequences of real numbers, Cauchy sequences, subsequences, Bolzano-Weierstrass theorem. Series of real numbers, absolute convergence, tests of convergence for series of positive terms — comparison test, ratio test, root test; Leibniz test for convergence of alternating series.
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Limit Points Open Interval closed and compact sets real analysis Gate IIT Jam 2012 mathematics
The set Y =(-1,1) therefore the derived set is [-1,1].
Option (d).
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Hello brother, hope you know the definition of limit points.
Here boundary points are also neighborhood of all of this point. So even boundary points also be included in it.
So [-1, 1] should be the answer.
So it is option (d).

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