题目信息
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?
$$a_{n}={{n+1}\over{n+3}}-{{n}\over{n+2}}$$
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:$$\frac{61}{63}$$
参考答案及共享解析

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正确答案:
D:$$\frac{40}{63}$$
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题目来源
Magoosh