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If n is a positive integer, then let f(n) be the sum of the digits of \frac{1}{5^{{}^n}} that are to the right of the decimal point. What is the smallest positive integer n such that f(n) > 10?

 Sep 16, 2020
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I can't really tell what fraction that is... please fix the latex! :)

 Sep 16, 2020

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