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Let f(n) denotes the square of the sum ...

Let `f(n)` denotes the square of the sum of the digits of natural number n, where `f^2(n)` denotes `f(f(n)).f^3(n)` denote `f(f(f(n)))` and so on.the value of `(f^2011(2011)-f^2010 (2011))/(f^2013 (2011)-f^2012 (2011))` is....

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