A) 11
B) 10
C) 9
D) 4
Correct Answer: A
Solution :
\[\frac{448r-7}{r-1}=889\] Þ \[\frac{b}{a},\frac{c}{b},\frac{a}{c}\] Þ \[{{\left( \frac{-1}{2} \right)}^{10}}={{\left( \frac{-1}{2} \right)}^{n-1}}\]Þ \[10=n-1\]Þ \[n=11\].
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