Okay so visualise 1 object, you can have only one combination, obviously.
For two objects, you can have 2 combinations, either one way round or the other.
For three objects, you have 6 combinations, for each piece you start with, there are 2 combinations.
For four objects, there are 24 combinations, for each starting object, there are 6 combinations (as there are 3 other objects), so total = 4x6
you can continue this logic as far as you want, as long as all the objects are unique. The answer for n objects is 1x2x3x4........xn.
Hope this helps
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