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In a fuel economy study, each of 3 race cars is tested using 5 different brands of

In a fuel economy study, each of 3 race cars is tested using 5 different brands of
gasoline at 7 test sites located in different regions of the country. If 2 drivers are used
in the study, and test runs are made once under each distinct set of conditions, how
many test runs are needed?
math   statistics and probability   
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3*5*7*2

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