Answers

2015-09-07T14:24:27+05:30
Common ratio is  \sqrt{2}  
so by using simple formulae
 x_{n} =a* r^{n-1}
where
r= \sqrt{2}       (common ratio)
a=2          (first term)
 x_{n} =128    (nth term)
which when we put in the above equation will give the value of n = 11
ie 11th term is 128

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