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A Ballroom dance couple has learned 11 different routines and is going to perform 9 of them at a local competition. How many different ways could they arrange their performance?

User Jankovd
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A Ballroom dance couple has learned 11 different routines and is going to perform 9 of them at a local competition. How many different ways could they arrange their performance?
User Eel GhEEz
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