${\color{#20A900}\text{Problem question is problem's title.}}$

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Count_of_factors_of_2
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is a function which returns the highest positive integer power of 2 that can be divided evenly (i.e., with a remainder of 0) into its integer argument and otherwise the function returns 0.

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n
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is a non-negative integer and is otherwise not specified.

The answer is 1.

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$2^n-\sum _{i=0}^{n-1} 2^i$ is $1$ .