# 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

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?
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Bertha Stark
To find the total combnations, the amount of each options with ecah other.
There are 3 race cars, 5 brands of gasoline, 7 test sites and 2 different drivers.
$3\cdot 5\cdot 7\cdot 2=210$