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Geometric Sequenceshard
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If ∑n=1∞an=10\sum_{n=1}^{\infty} a_n = 10∑n=1∞​an​=10 and ana_nan​ is a geometric sequence, what is the value of ∑n=1∞(an+3n)\sum_{n=1}^{\infty} (a_n + 3^n)∑n=1∞​(an​+3n)?