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
Solution :
\[{{S}_{\infty }}=\frac{a}{1-r}\] where \[-1<r<1\ \ i.e.\ |r|\ <1\].
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