A) 6
B) 5
C) 4
D) 10
Correct Answer: A
Solution :
\[\frac{a{{r}^{n}}-a}{r-1}=364\]\[\Rightarrow \frac{a{{r}^{n-1}}.r-a}{r-1}=364\] ?..(i) Þ \[\frac{3\times 243-a}{2}=364\] \[\Rightarrow a=1\] Now, putting this in (i), n = 6.
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