[AMU 1982]
A) For all values of $ r $
B) For only positive value of $ r $
C) Only for $ 0<r<1 $
D) Only for $ -1<r<1(r\ne 0) $
Correct Answer: D
$ {S_{\infty }}=\frac{a}{1-r} $ where $ -1<r<1\ \ i.e.\ |r|\ <1 $ .
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