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HMMT 2015 U7

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Let C\mathcal{C} be a cube of side length 2 . We color each of the faces of C\mathcal{C} blue, then subdivide it into 23=82^{3}=8 unit cubes. We then randomly rearrange these cubes (possibly with rotation) to form a new 3-dimensional cube. What is the probability that its exterior is still completely blue?

Dataset text NuminaMath olympiads. Quoted with source.

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\frac{1}{16777216}

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