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• 7 Is the sequence $x_n=\dfrac{1}{\sqrt{n}}\left(1+\dfrac{1}{\sqrt{2}}+\dfrac{1}{\sqrt{3}}+\ldots+\dfrac{1}{\sqrt{n}}\right)$ monotone?
• 7 I need a relation which is not reflexive, not symmetric, and not transitive
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• 5 True or False: The circumradius of a triangle is twice its inradius if and only if the triangle is equilateral.
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