\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
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C
⌫
\(\pi\)
e
\(\frac{a}{b}\)
!
←
→
(
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\(\sqrt{\,}\)
\(a^{b}\)
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\(\div\)
log
ln
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\(\times\)
cos
cos⁻¹
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-
sin
sin⁻¹
0
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=
+
tan
tan⁻¹
For a geometric sequence \((u_n)\) with common ratio \(r=3\) and \(u_0=1\), find \(n\) for \(u_n=81\).
\(n=\)
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C
0
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