009C Sample Midterm 3, Problem 3

Test if each the following series converges or diverges.

Give reasons and clearly state if you are using any standard test.

(a)  ${\displaystyle \sum _{n=1}^{\infty }}\,{\frac {n!}{(3n+1)!}}$

(b)  ${\displaystyle \sum _{n=2}^{\infty }}\,{\frac {\sqrt {n}}{n^{2}-3}}$

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