Answer
$\dfrac{1}{262144}$
Work Step by Step
Since, we have for a geometric sequence:
$a_n=a_1r^{n-1}$
Here, $n=12,a_1=16, r=\dfrac{1}{4}$
Now,
$a_{12}=16(\dfrac{1}{4})^{12-1}=\dfrac{1}{262144}$
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