I have read both two uses:
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The combinations of a, b and c, taken two at a time, are ab, bc, ac.
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We can not help but noticing a harmonious combination between classic and contemporary.
Are both uses interchangeable? Perhaps substitute combinations among for combinations of in the first sentence? Any idea is appreciated.
Best Answer
When two or more things are combined, it is a combination of them. You cannot have a combination 'between' or 'among.' 'Of' is the correct preposition to use.