olymmath

HMMT November 2016 U16

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Create a cube C1C_{1} with edge length 1 . Take the centers of the faces and connect them to form an octahedron O1O_{1}. Take the centers of the octahedron's faces and connect them to form a new cube C2C_{2}. Continue this process infinitely. Find the sum of all the surface areas of the cubes and octahedrons.

Dataset text NuminaMath olympiads. Quoted with source.

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\frac{54+9 \sqrt{3}}{8}

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