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OpenStudy (anonymous):
A hamburger shop sells burgers with cheese, relish, lettuce, tomato, onion, mustard, or ketchup. How many different burgers can be made using any 4 of the extras?
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OpenStudy (anonymous):
Assuming exact 4 of the 7 extras: \[C(7,4)={}_7C_4=\frac{7!}{4!(7-4)!}\]
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