GMAT 考满分题库

Magoosh - 数学PS - 335
A series is defined, for positive integer n, by

$$a_{n}={{n+1}\over{n+3}}-{{n}\over{n+2}}$$

What is the sum of the first 60 terms of this series?
  • A$$\frac{1}{6}$$
  • B$$\frac{1}{3}$$
  • C$$\frac{29}{30}$$
  • D$$\frac{40}{63}$$
  • E$$\frac{61}{63}$$
显示答案
正确答案: D

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