Let and for every integer

MATHEMATICS · Subjective · AP · Calculus BC · Infinite Sequences and Series · Infinite Sequences and Series

Problem

Let an>0a_n>0 and bn>0b_n>0 for every integer n≥1n\ge 1. If lim⁡n→∞anbn=5\displaystyle \lim_{n\to\infty}\frac{a_n}{b_n}=5, what can you conclude about the convergence of the two series ∑n=1∞an\sum_{n=1}^{\infty} a_n and ∑n=1∞bn\sum_{n=1}^{\infty} b_n?

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