Now predict how many ways there will be with 5 cubes.
Were you right?
How many ways with 20 cubes? 50 cubes? 100 cubes?
ANY number of cubes?
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If all the cubes are the same colour, a split of 4 and 2 will look the same as a split of 2 and 4.
How many ways are there of splitting 6 cubes now?
Can you predict how may ways there will be with any number of cubes?