CEED 2024

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CEED2024Q7·nat·Hard154 attempts

Coloured cubes (red and yellow) of equal size are arranged and stacked to form the cuboidal structure as shown in the image. If the ratio of the number of yellow cubes to that of the red cubes is 1:3, how many yellow cubes are NOT visible in the image?

Keyboards off — use the numpad, just like on exam day.