\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
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Let \((u_n)\) be the sequence defined by \(u_n = \dfrac{2^n}{n}\) for \(n \ge 1\). Which statement about its monotonicity is true?
The sequence is strictly decreasing.
The sequence is increasing from index 1.
The sequence is strictly increasing from index 1.
The sequence is not monotonic.
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