Power 3
Algebra
Level
3
\[ \sum_{n=1}^ \infty \frac{ { n }^{ 3 }}{ 3^n } = X\]
\(X\) can be expressed in the form \( \dfrac{a}{b} \), where \(a\) and \(b\) are coprime positive integers. Find \( a + b \).
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by
saharsh rathi