ISRO Electronics & Communication (ECE) 2017-2 - Question 53

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Topic: Engineering Mathematics

Let A be the series $\sum_{n=1}^{\infty}\frac{(-1)^{n}}{\log(n+2)}$ and B be the series $\sum_{n=2}^{\infty}\left(\frac{3n-4}{3n+2}\right)^{\frac{n+1}{3}}$ for real numbers. Then which of the following is true

  • A. Both the series A and B are divergent
  • B. Both the series A and B are convergent
  • C. Series A is convergent and series B is divergent
  • D. Series A is conditionally convergent and series B is divergent

Answer: D. Series A is conditionally convergent and series B is divergent

Explanation: Based on the official answer key, the correct option is (d). No detailed mathematical derivation is provided in the reference.

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