KA-0090
about 135sA cube 3 units on each side is painted all over and then cut into unit cubes. How many of them have exactly two painted faces?
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Needs an idea, not just a procedure.
3 in a row to finish this ladder.
0/1 solvedA cube 3 units on each side is painted all over and then cut into unit cubes. How many of them have exactly two painted faces?