Question

Show that  sum_{n=1}^{infty }(-1)^{n+1}frac{5}{7n+2}  is conditionally convergent.

10 Apr 2022
Answer :
Word Count : 321
The series in question is: \[ \sum_{n=1}^{\infty} (-1)^{n+1} \frac{5}{7n+2} \] To determine if this series is conditionally convergent, we can use the alternating series test (also known as the Leibniz criterion). This test states that an alternating series of the form: \[ \sum (-1)^n a_n \] converges if the following two conditions are satisfied: 1. \( a_n \geq 0 \) for all \( n \), and 2. \( a_n \) is decreasing (i.e., \( a_{n+1} \leq a_n \) for all _______ ________ _____ ________ ________ ____ ___ _______ _____ ________ ___.
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