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If the three sides of a cube which are adjacent to each other are coloured red and the remaining blue. The cube is cut into 8 identical cubes. How many of the cubes have at least 2 Blue colours?

If the three sides of a cube which are adjacent to each other are coloured red and the remaining blue. The cube is cut into 8 identical cubes. How many of the cubes have at least 2 Blue colours? Correct Answer 4

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For the three sides to be adjacent to each other, the cube shown in figure must have all the visible faces in same colour. And the hidden 3 faces are blue.
One of the corners that is hidden has 3 blue faces. And the 3 other corner that are hidden has 2 blue faces. Therefore totally, 4 cubes have at least 2 blue faces.

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