Closure of sets in cofinite and standard topology

In this video closure of finite and infinite subsets of R is studied in detail. Wathing this video you will be able to find the closure of any subset in any kind of topological space. An easier version of problem is easy to handle and better to understand.
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[jawerianawaz]

Thanks...sir lower limit Aur upper limit topology par bi closure bta den

[amna]

Sir lower limit ka closure or upper limit ka wo bi bta dy

[kmgaming]

Sir, closure of z in co finite topology me kya hoga?

[zahidgeelani]

Agr set of natural ki baat kre to vo b dense hoga na cofinite main