Find interior, Exterior, closure and derived set of A=(-1,1)∪{2,3,4} under usual topology on R

[@lalitkumarsharma477]

Saadar pranaam Madam.

[@latesttrends8379]

Thank you miss g 🥰
You are best

[@umm-e-khadija6893]

Thank you so much ma'am.....
Superb explanation ❤❤

[@HaseebaShaheen-0404]

❤❤❤ Thanks mam ❤❤❤

[@mathswithfarhan]

Such a great explaination🎉🎉🎉

[@mathworld5798]

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[@debasmitabada9547]

Thank you mam

[@mathswithfarhan]

Thank u ma'm

[@dineshkumar-pl3ix]

Mam whether {2},{3},{4}will be in it's interior as it is open in usaul topology

[@dineshkumar-pl3ix]

Can we say interior of A=(0,1) union {2} union {3} union {4}