emily is buying a double-scoop ice cream cone. there are 6 different flavor ice creams from which to choose. how many different combinations of two flavors can she have
The number of combinations = 6!/(2!4!) = 720/(2*24) = 15.
6C2 = 6*5 / 2*1 = 15
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The number of combinations = 6!/(2!4!) = 720/(2*24) = 15.
6C2 = 6*5 / 2*1 = 15