A) - 1
B) 2
C) 4
D) - 4
Correct Answer: B
Solution :
\[{{T}_{6}}=32\] and \[{{T}_{8}}=128\Rightarrow a{{r}^{5}}=32\] .....(i) and \[a{{r}^{7}}=128\] .....(ii) Dividing (ii) by (i), \[{{r}^{2}}=4\] Þ r = 2.
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