Let x ∈ R ^n and r > 0. Is the set B(x, r) = {y ∈ R^ n : ||y − x|| ≤ r} a closed set in R ^n? Y/N

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Let x ∈ R ^n and r > 0.
Is the set B(x, r) = {y ∈ R^ n : ||y − x|| ≤ r} a closed set in R ^n?
Y/N

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