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Mathematics, 04.08.2021 07:40 jfvjhsljdl

a 5cm by 5cm by 4cm block is built from one hundred 1 cm x 1cm x 1cm cubes, each of which is coloured red or white. The cubes are arranged in such a way that no two cubes which touch along a face are the same colour. What is the number of red faces in the interior of the block?

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