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Sum of Numbers on Invisible Faces
The faces of a polyhedron are labeled 1, 2, 3, …. Find the sum of the numbers on the invisible faces.
Contributed by:
Izidor Hafner
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Izidor Hafner
"
Sum of Numbers on Invisible Faces
"
http://demonstrations.wolfram.com/SumOfNumbersOnInvisibleFaces/
Wolfram Demonstrations Project
Published: October 23, 2013
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