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Geometric Sequencesmedium
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If ana_nan​ is a geometric sequence such that an=2n+13na_n = \frac{2^{n+1}}{3^n}an​=3n2n+1​, what is the value of the infinite sum ∑n=1∞an\sum_{n=1}^{\infty} a_n∑n=1∞​an​?