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Infinite Seriesmedium
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Given ∑n=1∞an\sum_{n=1}^{\infty} a_n∑n=1∞​an​ is a series of positive terms and lim⁡n→∞an+1an=1\lim_{n \to \infty} \frac{a_{n+1}}{a_n} = 1limn→∞​an​an+1​​=1, which of the following is true?