Answers

2016-07-15T10:14:09+08:00
There are three formula in getting the geometric series:
S_{n} = (a_{1} (1-r^n))/(1-r)
S_{n} = (a_{1}-a_{n}^r)/(1-r)
S_{n} = (a_{1}-a_{1}r^n)/(1-r)
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