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JH

# For which of the following series is the Ratio Test inconclusive (that is, if fails to give a definite answer)?(a) $\displaystyle \sum_{n = 1}^{\infty} \frac {1}{n^3}$(b) $\displaystyle \sum_{n = 1}^{\infty} \frac {n}{n^2}$(c) $\displaystyle \sum_{n = 1}^{\infty} \frac {( - 3)^{n-1}}{\sqrt{n}}$(d) $\displaystyle \sum_{n = 1}^{\infty} \frac {\sqrt{n}}{1 + n^2}$

## a. The Ratio Test is inconclusive.b. The Ratio Test is conclusive.c. The Ratio Test is conclusive.d. inconclusive

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