A) 5
B) 4
C) 3
D) 2
Correct Answer: D
Solution :
\[a=7\,\,\text{and}\,\,a{{r}^{n-1}}=448\] Now,\[{{S}_{n}}=\frac{a({{r}^{n}}-1)}{r-1}=889\]\[\Rightarrow \frac{(a{{r}^{n-1}}.r-a)}{r-1}=889\] Þ \[\frac{448r-7}{r-1}=889\] Þ \[r=2\].
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