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∑n=1∞n33n=X \sum_{n=1}^ \infty \frac{ { n }^{ 3 }}{ 3^n } = Xn=1∑∞3nn3=X
XXX can be expressed in the form ab \dfrac{a}{b} ba, where aaa and bbb are coprime positive integers. Find a+b a + b a+b.
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