Question 1138907
(2 choices of tortilla) * (4 choices of meat) * ({{{2^7}}} choices of extras)
= ___________

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Each extra can only be  (1) in the fajita or (2) not in the fajita.  In this way, each extra contributes a factor of 2 to the total number of fajitas.  Counting shows that there are 7 of them.