Let X = (a, b, 1, 2, 3) and T = {X, ̟, {a), (1,2), (a.1,2), (b,1,2,3}). Let B = {a, 2, 3) * None of the choices O Bis open in (X,T) Bis closed in (X,T) O Bis dense in (X,T)

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A: Thanks for the question :)And your upvote will be really appreciable ;)

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