180 Days of Ideas for Discussion in Math Class.
(as of 9July2014, we're in overtime!)

Friday, March 27, 2015

413: Red and Blue Rubik

Suppose that a white Rubik's Cube is painted blue on top and bottom and painted red on the four lateral sides. The cube is then separated into its 27 smaller cubes.

How many unit cubes have at least one red face and one blue face?

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