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This is a Geometric Sequence
Each term is the form ar^{n-1[tex]a = 2

for n = 1
a = 2
for n = 2
 2r = 1

r= \frac{1}{2}

ar^{n-1}=2(\frac{1}{2} )^{n-1}= \frac{1}{128}= \frac{1}{2^7}
So its the 9th term
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