\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
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A student claims: "To show \((u_n)\) is increasing, it is always enough to prove \(\dfrac{u_{n+1}}{u_n} \ge 1\)." Which statement is correct?
True, this works for any sequence.
False, this works only when \(u_n > 0\) for all \(n\).
False, because the ratio is never defined.
True, but only for decreasing sequences.
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