A deli offers 5 different meats, and a choice of 2 breads.  Each sandwich must have 3 different meats on it.  How many different sandwiches can be made?
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3 meats out of a possible 5 gives (5*4*3)/(1*2*3)=10 different combinations. Each of these can be made with one of two different breads, so the total of bread and meat is 10*2=20.
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