Answers

2016-07-14T05:37:01+08:00
S sub n =A sub 1 - A sub n time r ---------------------------------- 1-r If 1 is not equal to r If r is equal to 1, S sub n= n(a sub 1) If r is -1 and n is even , S sub n=0 If r=-1 and n is odd , S(sub)n= A(sub)1
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