Answer
$a_n=10^{-n}$
Work Step by Step
If we look at the pattern:
$ 0.1, 0.01, 0.001, 0.0001, ...$
$10^{-1}, 10^{-2}, 10^{-3}, 10^{-4}$
The nth term in the sequence is:
$a_n=10^{-n}$
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