Mathematics · Real Analysis
Which of the following sets is NOT closed in &double;R?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1{n2 : n ∈ &double;N}
- 2&double;R \ ∪n=1∞ (n, n+1)
- 3{1/n + 1/m : n, m ∈ &double;N} ∪ {0}✓
- 4{1/n2 : n ∈ &double;N} ∪ {0}
Correct answer
{1/n + 1/m : n, m ∈ &double;N} ∪ {0}
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